Jack`s Corner - Gun Club of America
Transcription
Jack`s Corner - Gun Club of America
Connection Contents 2 3 4 6 Note from the President 9 Question of the Month Coming Next Month Is being a 'Prepper' What's in this month's issue Jack's Corner How can Wildcatting make you self-reliant? 10 The Remington 760 Gamemaster 12 14 15 Student Certifications 16 Video Index Resource Directory Name That Part Contest! Jack's Dumb Statements The GCA Connection and GunTech DVD Magazine are published and produced by The Gun Club of America and distributed solely to current GCA Members. ©Copyright GCA 2014. All rights reserved. No part of this DVD or newsletter may be copied, reproduced, rented or transmitted for any reason without the written permission of the copyright holder. Contacting GCA: GCA, 351 Second Street, Napa, CA 94559, 800-435-4262, Fax 707-253-2150, www.GunClubOfAmerica.com Submissions and contributions: We welcome you to submit articles, stories, photos and videos for publication in the GCA Connection and/or GunTech DVD Magazine. GCA pays for submissions and contributions with "AGI Bucks." These coupons are redeemable dollar-for-dollar towards the purchase of any AGI product or AGI video course. Articles: Email your articles to [email protected]. Articles and stories must be submitted in MS Word or MS publisher format. We pay for stories and articles we print by the word: 100-300 words = 20 AGI Bucks, 300-500 words = 50 AGI Bucks, 500+ words = 100 AGI Bucks. Photos: Electronic photos must be submitted in a jpeg format with a resolution of at LEAST 640x480. Print photos are accepted but GCA cannot return any printed photos and all submitted photos will become the property of GCA. Videos: Videos must be on DVD or on MiniDV tape, S-VHS tape or Hi-8 tape. We cannot return any video tapes and all submitted videos will become the property of the GCA. All videos must have sound on the tape that explains what we are watching. We pay by the minute for each minute (or portion thereof) that we use. 10 AGI Bucks per finished minute. Subscriber information - missing or damaged issues: If an issue of the GCA Connection and/or GunTech DVD is lost in the mail or arrives damaged, simply contact GCA at 800-435-4262 for a replacement. 2 A Note from the President . . . These days having the label “Prepper,” “Survivalist,” or the like, applied to you by the media puts you on the very fringe of society and somehow makes you seem selfish, evil and quite possibly off the deep end. I will agree that some people let their paranoia get a bit out of control, but I also do like the saying “Just because I’m paranoid, doesn’t mean they AREN’T out to get me!” They take the preparedness thing to obsessive/excessive levels and invent terrible scenarios in their minds which can make them worried and physically sick. I personally think that being prepared is a core component of American life and freedom. Properly positioned, it is a mind-set of self-reliance, while retaining compassion for others less prepared or fortunate. I personally filter my preparedness with a dependence on the Lord Jesus, knowing that my days are numbered and his to control, and that there is a greater plan for my life than I can possibly know. Thus the balance for me is weighing the knowledge I have of the world and world conditions, my Boy Scout training and personal bent on one side of the equation and my faith in the Lord on the other side. This provides what I believe to be Biblical balance in my life. This also protects me from being panicked by every rumor or tremor in society. The Bible clearly teaches that we should be “Wise as serpents and innocent as doves.” My understanding of this principle is that we should be aware and prepared for anything we clearly perceive as a threat, yet not become evil or tip over into the dark side protecting ourselves from every real or imagined threat. In the Old Testament, Joseph was given a vision of seven fat years of productivity and seven lean years of famine. His belief and action (an important set of words), led the Pharaoh and the nation to store up a huge surplus in the “fat years.” This not only saved them through the lean years of famine but also made the kingdom rich as the people and nations from around the known world had to purchase food from Egypt. This history provides us knowledge in many areas, including balancing our personal budgets and saving for the future. I use this teaching and technique in my personal finances and that of our businesses. For example, when prices are low on a product such as a type of ammunition, I am a buyer and will inventory more than I need at the moment. When the supplies dry up and a panic ensues, I can calmly stand aside, letting others pay exorbitant prices or go lacking. The same approach should apply to saving money, buying property, or even “prepping” and storing some food or other commodities. Continue on page 5 GunTech 96 . . . What's in this month's issue SHOT Show Highlights Gene has a blast shooting Century Arms latest AK variant, their Zastava M92 AK “Pistol” shown here. Gene also interviews a representative from Watkins Tool and Supply and shows us their 80% AR lower kit with building fixtures and cutters. Tips for the Woodsman Darrell Holland tells you why you need “The Last Straw,” the Aqua Mira Frontier Filter Straw. Next Darrell and Keith find themselves more than “half in the bag” while inspecting Darrell’s range bag. Camera Product Reviews and Evaluations Jack tests ProMag’s 30 round polymer Mini-14® magazine at the range and looks through the Yellow and Smoke Mirror Bomber shooting glasses from Dillon Precision. Tool of the Month Jack’s tool this month is the 10-8 Performance Armorer’s Tool. Simple, inexpensive, and useful. In the War Room John Bush shows some really interesting and unusual open bolt .22s, like the Marlin Model 50 above. SHOT Show Highlights Gene demonstrates “Target Vision,” a wireless camera/monitor that allows you to view your bullet holes on the target without leaving your bench. Monitor Tips from the Workbench Ken Brooks solves the mystery of re-installing SxS shotgun hammers, this time with a Savage 311. Bench & Field Evaluation This month it is the MC 27 Semi-Auto Pistol from Chiappa; the Good, the Bad, and there ain’t no Ugly! GunTech Special Feature Gene interviews the IWI (formerly IMI) factory rep in Israel and discusses the design and use of the Tavor Bullpup design. Disassembly/Reassembly Course This month Ken does the strip and re-dress with the Henry .22 LR lever gun. 3 Jack’s Corner Jack Landis is AGI Technical Services Manager, GCA Connection and GunTech Editor This month begins a change in the layout of this magazine. As you all know, for eight years (Happy Eighth Anniversary GunTech!!) we’ve taken up a page or four, depending on whether it is the SHOT Show issue or the October Christmas Buyers Guide, with our Program Guide. It is that long because we go into a fair amount of detail about the contents of each segment of the video. Add the verbiage and usually a picture and we end up using more space than it probably warrants, I mean you are going to watch the segments anyway, right? And, we’ve been getting requests to add to the amount of gun related content, i.e. articles, questions, tips, and such. Therefore, we are going to drop the Program Guide and go with the shorter "What's in this month's issue." We’ll still have a picture if appropriate, but the description will shorten up to about one sentence. That should cut the size by at least a half. Let me know what you think. The end of this month marks the beginning of a slightly less frantic part of the year for The Boss and I. May through mid-November have a few less commitments and trips than Thanksgiving through the end of April. The last/first part of the year has a pair of GSSF Glock pistol matches, the Thanksgiving trip to Steelhead on the Klamath, Christmas, New Years, a week of SHOT, another week of NRA, a few trips to Napa and round that out with a few trips to northern Nevada for wife’s family business. You can see how a run-down old guy might get just a touch frazzled . . . but then we’re not talking about Mr. Kelly, we’re talking about me. And even for one as youthful and vigorous as I, the schedule can get just a might hectic. I’ll be relaxing on my early June Ground Squirrel Safari to Susanville this year while trying out my latest project. This is a .17 Ackley Hornet in a T/C Carbine. I’ve had the gun done for a few (10!) years, cases formed and components on hand, BUT, until the past couple of years I have not had convenient access to a private range to do load 4 development. Imagine, if you will, trying to do load development on a public range with ½ hourly line breaks, nowhere out of the wind to load cartridges (powder scale readings are a might erratic in the wind or in the back of your car). Also, lots of people stop by to ask questions or offer their own invaluable advice on a subject they obviously know nothing about. Just because I get paid for that very thing doesn’t make me like it better when subjected to it myself. All that being said, I finally got around to doing some loading and shooting with the gun. The barrel was made by Fred Smith of Bullberry Barrels many years ago. It is a 24" full diameter bull barrel in chrome moly. I have a half dozen of his barrels and they are all tack drivers. The one in .17 HMR was used by my daughter Jeanne to kill a rockchuck from a truck window at about 200 yards when she was about 14 or so. Oh Baby! The picture of her shooting it was the desktop of my office computer until just a few years ago. Some dads have pictures of their daughters at their proms or graduations, but Hey!, I’m a gun guy. The .17 Ackley Hornet is just the .22 Ackley Hornet necked down to 17 caliber. For those of you fresh to the reloading game, an Ackley Improved cartridge is a standard cartridge, say a .30/30 Winchester, with the body taper reduced as much as possible while still getting easy extraction, the shoulder moved forward, and the shoulder angle sharpened to 30 or 40 degrees. When the Ackley chamber is properly cut, you can shoot factory ammo, in this case .30/30 Winchester, in the Ackley Improved chamber. Bull Barrel dimensions This also fireforms the factory brass to the Ackley dimensions. The Ackley brass holds somewhat more powder than the original factory case and the powder is thought to burn more efficiently in the straight wall, sharp shouldered case. Ackley proved that the straight wall shape also reduced thrust against the bolt/breech face. If you want to get into Wildcatting, the Ackley Improved cartridges are the easiest way to get started. The fact that you can shoot factory ammo is a big advantage if you run Note from the President continued . . . The question is; will you be in a position to be benevolent or will you be locked out, begging and suffering? The same applies to getting the knowledge you need NOW rather than later. It may not be available then or your need to apply it might be instantaneous. Not having it could prove disastrous. A further benefit when it comes to gunsmithing, this is also a highly “barter-able” trade. Try trading “therapy sessions” in a crisis for food, ammo, repairs, or the like. Good luck with that!! .17 Ackley Hornet left, .22 Hornet right. Note straighter body, shorter neck, and sharper shoulder angle on the Ackley. out of or, as has happened, your reloaded ammo gets left at home. The .17 Ackley Hornet is a VERY efficient little cartridge. Like most small cartridges you get more velocity than you would expect from a small amount of powder. The .17 Ackley has always had the reputation of being able to move the 25 grain Hornady at 3,500 FPS. I don’t know about that as I’ve not loaded any Hornet cases with the 25 grain bullet, but I’m here to tell you that 12.0 grains of Accurate Arms AA-1680 will cause the 20 grainer to move out smartly at 3,550 FPS with no pressure signs. That’s enough sheer velocity to absolutely inflate a ground squirrel to a cloud of red mist. Impressive! The .17 Ackley Hornet IS NOT the Hornady .17 Hornet. Do not attempt to load the Ackley in the Hornady chamber, evil things will occur. I believe (DO NOT TRY THIS AT HOME!) that you should be able to safely load the Hornady in an Ackley chamber without dire results, but I have not yet tried it. Since the cartridges headspace on the rim, the slightly smaller dimensioned Hornady would headspace properly. Fred Zeglin has an article on Wildcatting in this issue. I hope you caught him on this month’s GCA Live webcast. Now that you know what my summer is likely to revolve around . . . Til next month, break some new ground ‘smithing and shooting, and introduce someone new to each, Jack Landis (800)797-0867 x 104 • [email protected] It pays to have solid knowledge of trade skills. If you haven’t already done so, find out how you can learn to be a gunsmith at www.AmericanGunsmithingInstitute.org. To learn Machining, Welding, Carpentry, Masonry, Electrical, Locksmithing, and Plumbing, go to: www.InstantTradeSkills.com You can learn all of these skills right from the comfort of your home. Knowing these skills is an important part of “Prepping.” One of my favorite proverbs is “Dig the well before you thirst.” Think about it. Get prepared, not paranoid. Get the skills you need to keep you and your family going in any circumstances whether it be gunsmithing or other trade skills. God Bless, Gene Kelly, president GCA & AGI Life's truths . . . It is a mistake to allow any mechanical object to realize that you are in a hurry. One theory is there is a special circuit in machines called a "critical detector" which senses the operator's emotional state in terms of how desperate he or she is to use the machine. The "critical detector" then creates a malfunction proportional to the desperation of the operator. Threatening the machine with violence only aggravates the situation. Likewise, attempts to use another machine may cause it to also malfunction. They belong to the same union. Keep cool and say nice things to the machine, nothing else works. Author unknown 5 How can Wildcatting make you self-reliant? By Fred Zeglin; AGI Instructor, Cartridge Designer and Author. Lassen College Gunsmithing Graduate Wildcatting teaches you many things; chief among them would be a good understanding of headspace and pressure, both topics of primary importance in reloading. When you understand headspace as it relates to reloading dies, guns, and ammunition you can resolve many problems that perplex the average shooter. Understanding pressure will help you select appropriate components for both wildcat and factory designed cartridges. I have a book in my personal library, “The Home Guide to Cartridge Conversion” by George C. Nonte, Jr. This book offers suggestions with each cartridge described as to how you might make brass. It covers cartridges in Metric as well as U.S. designs. This book has become collectible but you really do not need the book to figure out these relationships. All you really need are some measuring tools and an understanding of how far brass can stretch when you’re reforming it. The first cartridge I ever formed was a .25-06 from .30-06. I had no idea what I was doing but I had read all about the process. I was expecting the sizing down to be a problem because of all the articles I had read. Turns out it’s no big deal. After all I was really only working the neck of the case. But that experience took the mystery out of the process for me and the next time I needed to form brass, I just dove in. You might wreck a few pieces of brass but that’s how you learn. As you learn to form brass for your wildcats, you’re also learning how to adapt and make use of what is available to you. Of course, that is not normally the concern when you’re wildcatting. Rather we are trying to solve ballistic problems, adapt a cartridge for a new firearm or just have a little fun. But this experience can easily be utilized to get by when supplies are hard to locate. Let’s say times are hard. You have a barrel but no reamer. If you dig into wildcatting you can learn how to make your own chamber reamers. On top of that you can make reamers for reloading dies. Sometimes knowledge and scraps of material are available when there is little or no money to be had or wasted. Ask Grandpa if he ever had to make do with what was on hand. I can hear guys saying, “But if times are hard I won’t be able to get tool steel to make dies…” Guess what? Modern chromoly (blue) barrels are nearly all made from either 4140 or 4150, both tool steels that can be hardened for dies. So, a shot-out old barrel might be a good source of die material. This material would then be oil quenched when hardening. Keep a few sticks of oil hardening drill rod around the shop. You can easily turn out a reamer for any cartridge you design or even for any existing cartridge. This is how gunsmiths in days gone by acquired reamers before there were companies they could order from. On occasion, time is more important than money, so being able to make a reamer in-house can save weeks of waiting. Most of the times I used this trick were when I needed a special neck or throating reamer and simply could not wait for one to arrive from the reamer maker. 6 A cannon reamer for a chamber neck is shown here. The most common name for these reamers are “half reamers” or “cannon reamers.” They are easy to make. Simply turn a blank on the lathe in the shape and dimensions you need for your chamber or die. Then you can file, grind, or mill away half the profile. You will need to build in a pilot and a drive end. I normally harden them at this point and then grind relief into the reamer so it will actually cut and not drag or gall the chamber. A little hand sharpening for good measure and you have a reamer. The picture to the right shows a cannon A cannon reamer for the full chamber reamer for the full chamber. Looking at the flat, you might consider this a single tooth cutter. The picture below shows the reamer in profile so you can get a better idea of the relief grinds. Take a look at any professionally made reamer in your collection and copy the reliefs. It’s not difficult. Are these tools beautiful? Not really, but they work and in a pinch can be a real life saver. Wildcatters who learn to make their own tools will be able to Profile of a cannon reamer for the full chamber test more ideas simply because of the saved time and money. Reloaders who wish to be self reliant should also invest in a “Vickerman” style bullet seating die (http://vickermandies.com). These dies are known as inline style bullet seaters. In their various forms they are nearly always more accurate than conventional seaters that come with a die set. One inline die can be used for just about any cartridge simply by changing out the inserts. Naturally, this saves money over buying a complete die for every caliber and is super useful to the wildcatter. The best forms of this die are not cartridge specific but rather work on the neck and bullet diameter. Ponsness/Warren Cal Die There are numerous die makers offering variations on the inline bullet seater. Some are specific to the cartridge, which of course is not the version we are looking for here. Meacham, Ponsness/Warren and Vickerman are all versions that work on the case mouth. This allows you to use the caliber insert for any cartridge of that caliber without regard to the shape of the case. In the Ponsness/Warren die pictured here the caliber insert is sitting in the window of the die. This insert floats up and down in the die during the seating process. This type of insert Ponsness/Warren die rests on the case mouth while holding the bullet aligned with the case for easy and accurate seating. The most important feature of inline dies like this is the ability to change from one caliber to another by changing the insert. Those of you who have done any work on a lathe will immediately recognize that these inserts can easily be turned out in a few minutes for any caliber, thus, adding to your self-reliant list of skills and abilities. Now that I have shown you some quick and cheap ways to make tools and dies, let me show you one other way to make reloading dies that allows you to skip the need for a reamer at all. Left: The beveled end of the insert is where the case mouth centers up on the bullet. Right: The top of the insert. When you drop the bullet in the window, it centers up in the insert, ready to be seated. I use the body from the inline seater pictured above to hold 5/8” diameter sizing dies. I use these primarily to prove out ideas and test new wildcat designs. They are not as good as a conventional sizing die but they are expedient, meaning I can be forming brass in less than an hour in most cases. Heavy forming of large diameter cases is not recommended in these 5/8” inserts. Even so, they could be used for proof of concept. Taking 5/8” drill rod or 4140 tool steel, I cut it to length and face it for the desired cartridge. Normally I make these dies in two pieces, 7 one for the body and one for the shoulder and neck. By doing so, it makes fabricating to body and shoulder angles easy without need for a one piece reamer. On the lathe, I use a boring bar to cut whatever taper I may need for the body of the case. Utilizing the compound on the lathe, you can set the angle you want for the shoulder then ream or bore the neck diameter. You can even make an insert for the neck only if all you’re doing is sizing the neck. This is a really fast way to test a new caliber. Alignment of these two piece dies is not a problem. I have used steps to interlock the pieces and I have used beveled ends to make them self align. Both work and neither is really necessary. The simplest form is to face the two parts square, then when I form the first piece of brass, I leave the jam nut that holds them in the die body a tiny bit loose. The two parts naturally center up on the brass. I then tighten up the jam nut before fully extracting the newly formed case. Every trick or ability you add to your bag of tricks makes you better able to make a living, serve clients and survive in good times or bad. The tips mentioned here are tried and true, having been used by more than one generation of gunsmiths. You need not reinvent the wheel. P.O. Ackley was known to supply a set of reloading dies with Here is a collection of the 5/8” die inserts I have whipped out when I needed dies in a hurry. any wildcat rifle he built. He picked up this habit for two reasons. First, it meant extra income and second, his client was assured of having dies that matched his chamber correctly. The “Taming Wildcats” video I did for AGI explains more than just how to design a successful wildcat. Even more important is the detailed information on how to make your own chamber reamers and reloading dies. This is nearly a lost art for today’s gunsmiths. Check it out below. Everything you ever wanted or needed to know to design and build your own custom cartridge and reamer! Taming Wildcats is taught by Custom Gunsmith Fred Zeglin, renowned cartridge designer and builder of the well known Hawk series of cartridges. Fred will get you on the road to a thorough understanding of Wildcats and Wildcatting, showing you everything you need to know to do it yourself. Over two hours in length, this course takes you smoothly from the dreamin’ up and design phase through the actual case forming and chamber reaming stages. If you can run a lathe, you will be able to make your own reamers after watching this detailed course!! How to do ballistic research and the software programs that are available to help you design your cartridge case are ALL covered. You don’t have to be a master machinist or a tool and die maker to be able to turn out resizing/forming/chamber reamers on the lathe. AND . . . Fred shows you why you don’t need an expensive tool post grinder. A bench grinder with a good, squared edge, fine grinding wheel and some practice will, with Fred’s expert and easy to follow guidance, enable you to turn out reamers that will equal anything you can buy - for a WHOLE lot less!!! Oh yeah, and he shows you how to sharpen and heat treat them as well! $79.95 plus ship. Only $63.96 for GCA Silver Members! Call 1-800-797-0867 to order yours today. 8 THIS COURSE WILL SAVE YOU A LOT OF MONEY!! Question of the Month Jack, I got a Remington 48 in last week with one of the links stuck between the action spring tube and the action spring follower. Of course Remington redesigned to prevent this on the 11-87. Do you know if an 11-87 action spring follower would work in the model 48? If it would, I could TIG weld a "knob" on the ends of the links, and file them to hook into the follower and this problem would never come back. If not this solution, is there another way to prevent this type of jam? Gary Gary, Well, I have seen only one Remington Model 48 in my entire life. Therefore I really didn’t feel competent to answer this question. Hmm, let’s see, who might possibly know the answer to this question? You know, someone who was already a gunsmith with decades of experience when the gun made its debut in 1949? Hey! I know, how about Himself, the venerable Bob Dunlap? Yeah, sure, he would know. I forwarded this on the The Great One and he replied as follows: If the follower and tube are OK, just TIG weld the ends of the link together and taper them slightly so they cannot get between the follower and tube. Do not soften more than ¼" of the ends of the links when welding. Bob Jack, Man, I love that guy! Thanks a bunch. What a simple fix. When you hear what Bob comes up with, do you ever ask yourself, "Why didn't I think of that?" The gun now works great, and I'll bet this problem never comes up on this gun again. As soon as I get some down time, I'm going to do this to my own old 48. Gary Yeah Gary, I ask myself that all the time, that’s why he’s The Great One. Jack Coming Next Month The month of May is traditionally when it starts to heat up and things will definitely be heating up in the May issue of GunTech! Tavor TAR Bullpup Rifle from Jerusalem with Love This month Gene visited the IWI factory in Israel and checked out the new Tavor bullpup battle rifle. In the May issue we take things to the next level when we conduct a full bench and field evaluation of the Tavor to see just what it’s made of! John Bush will be back in “The War Room” and this time he is going to give you just a peek at the amazing world of adaptors. Not sure just what that means? Then you’ll just have to wait until next month to find out but trust us… if John knows all about it, then it’s pretty darn interesting! Gene is going to check out a “stock to end all stocks” (at least that’s what KRG thinks!) and a belt-fed rifle you can own! Meanwhile… Darrell, Jack and Keith will be reviewing new products and Ken will be back at the workbench with another great tip. Speaking of tips… In “Tips for the Woodsman” Darrell will shed some light on, well… lights! He will be showing you several makes and models in order to give you a snapshot of the current market when it comes to features, performance, and cost. Of course it wouldn’t be GunTech without your Disassembly/ Reassembly Course would it!? Chiappa MC 27 Fear not, we didn’t leave it out! In fact, this month we will have another world’s first! Ken will take you through the complete disassembly and reassembly of the new Chiappa MC 27 pistol which we JUST evaluated!! You can see the May issue has a lot to get excited about, so you may want to start making extra ice and turn up the air conditioning now, just to keep from getting hot under the collar over next month’s issue of . . . GunTech! 9 The Remington 760 Gamemaster By Robert Dunn, American Gunsmithing Institute Master Gunsmithing Course graduate, GCA Member, AGI/GCA video producer and cameraman. I would like to start this article by saying that my neighbors are the best folks on this planet. They have literally helped me survive the last several months of my life. They have helped me with everything from food to firewood to simple friendship. One thing that we all seem to have in common is a love for firearms. I spent some time over at my neighbors, Grant and Mapril, and we laughed about the fact that we don't have too much of a crime problem out this way because everyone knows we are all “adequately” armed and protect one another. With that being said we spent the morning talking about firearms and they showed me some of their cherished guns. I showed a particular interest in a Remington Model 760 and, without hesitation, Grant handed me a box of .30-06 cartridges and the rifle and told me about his favorite place shoot on his land. Like I said, I love my neighbors! Anyway, the Remington Model 760 was introduced in 1952 and production ceased in 1981. That is a pretty good run. During this time period Remington manufactured over one million of these pump action rifles. The 760 replaced the Model 141 and was replaced itself by the Model 7600. L.R. Crittendon and William Gail, Jr. designed the Model 760. The rifle has the classic Remington profile and looks great topped with a scope. The receiver is made of steel and is machined. The magazine is a removable box. The 760 utilizes a rotating bolt that has 14 interrupted thread type lugs that lock into recesses in the barrel extension. The locking system is very strong and thus safe in the case of an overload, etc. The twin action bars allow the rifle to cycle smooth and fast. The action bar lock also acts as the 10 disconnector on this firearm. The magazine holds four cartridges. When disassembling the 760, you can open the action and put a punch in the holes in the action tube to break it loose from the receiver. The action tube can then be unscrewed. The action tube guard should have some play when the gun is assembled so it does not push up on the barrel. The barrel comes off the receiver by pulling it off. If it is tight, slam the pump forward (bolt closed) a couple of times and it will eventually come off. There is a part called the action tube guard that prevents the barrel and the action tube from hitting one another. Next, you can unlock the bolt from the barrel and rotate the forearm and action bar around the recoil lug to remove it from the barrel. The barrel consists of the barrel itself, the barrel extension, and the recoil lug (barrel bracket). The barrel extension contains the locking recesses for the locking lugs of the breech bolt. A special wrench can be made to unscrew the barrel extension and the recoil lug can be driven off. If you have to correct headspace, you can do a barrel set-back by taking off the barrel extension and the recoil lug and setting the barrel back as much as needed to correct the headspace. It is easiest to face off the amount you need to correct from the recoil lug. You also have to face off the end of the barrel so the bolt will fit correctly. You must then use a chambering reamer to adjust the headspace. Most of the bolts snap into the action bar but some are silver brazed in. The bolt utilizes a cam locked system and the bolt head (breech bolt) is rotated/screwed into the locked position by two cam pins in the bolt carrier. When the bolt is locked up, the firing pin can reach the primer to fire the gun. If it is not locked up, the firing pin cannot hit the primer of the cartridge. The cam pins can be pushed out of the bolt head to take the bolt apart. Headspace can also be corrected by making two new cam pins out of 4140 alloy type steel that are hardened and drawn back to a purple/blue color. The cam pins must fit very precisely in the cam slot. This will take up some of the “slop” (or play) in the bolt. Now, when the gun is closed the bolt head will rotate farther, thus correcting the excessive headspace. These Remington rifles do not develop excessive headspace very often. The action bar lock locks behind the action bar. This is what keeps the gun locked up. The engagement angle of these parts should be slightly positive. In most cases, this will prevent problems associated with the shooter “squirreling.” Bob Dunlap likes to see .010" to .020" clearance between the action bar and the action bar lock when the gun is closed and locked up. .040" will not hurt anything though, and is actually Remington’s spec. There is some play between the bolt head and the bolt carrier. This play in the semi-automatic version of the rifle will delay the unlocking of the gun enough to allow the bullet to get past the gas orifice and move the action bars back before the gun actually begins to unlock. The bullet will have exited the barrel at this point too. Here we can see the interrupted threads on the bolt of the 760 This series of firearm is not the most accurate. The early model’s barrels were held onto the flat front face of the receiver by a nut screwed onto the end of the forearm tube, against the barrel’s recoil lug. The barrel would tend to wander from shot to shot and accuracy suffered. You can 3-point bed the receiver to the barrel to improve its accuracy (like a three legged milking stool) so the point of impact remains consistent. Make sure the forearm spacer does not touch the barrel on the pump version of the gun. The early guns tended to break stocks because they did not have stock bearing plates. The stock bearing plate increases the amount of surface area the stock has to bear against. To prevent breakage and improve accuracy, glass bed the stock to the stock bearing plate (this will lock the stock into the receiver). The auto version has a disconnector in the fire control system. If the gun cycled but did not close, the disconnector would be underneath the action bar and pulling the trigger would not drop the hammer. The pump actually works the same way. The difference is the pump gun’s action bar lock has a slightly positive engagement angle with the action bar and the auto gun’s disconnector has negative engagement with the action bar. The trigger has two connectors on it (one on the left and one in the center of the trigger group). When you pull the trigger, the connectors move forward and the central connector bumps into the sear, causing the top of the sear to move rearward out of engagement with the hammer…the gun fires. The spring and plunger that power the hammer Continued on page 13 11 February Student Certifications Professional Gunsmithing Introduction Eric Gard William Boyd Robert Phillips Robert Bingaman Benjamin Jones Naomi Degraff Robert Chase Michael Caudle John Kocinski Kurtis Riley Michael Morrissey Eric Pindar Aron Troy Vandergriff William L. Foster Thomas Tveit Floyd Crawford Arek Matthew James Worthing Kevin Young James Charette Bradley Kuhlemeyer Gary Mudder Robert Foster Gary Smith Chris Norton Lee Mazanec Daniel W. Willoughby David Lancello Rocco A. Saccento Evan M. Gerber Harry Van Phillips 12 Professional Gunsmithing Handguns William Boyd Ernest K. Reyes, Sr. James Charette Lee Mazanec Bradley A. Martin Travis Dagley Chuck Hathaway Kevin Herman Jonathan O'Brien Michael Harper Luke Walker Adam Hyman Jerry Reinbold Jeremy Luersen Jonathan Olewine Greg Hadcock Frank Twiss Joseph Johnson Peter Dooley T.A. Pittmon Randy Stone Professional Gunsmithing Rifles Wayne Walker Ray Sockwell Harold Lane Jason Williamson John Smey Adam Lannon Dennis Perger Marcus Shaw Eugene H. Hisey, Jr. Howard L. Adams Eric Joseph Rodriguez Professional Gunsmithing Shotguns Brian Davison Brent Lake Michael Hamilton Alan Wooden Mark Purvis Ronald Berry Adam Webb Steven Ashmore Brian Rusk Robert Stackhouse Doug Roliff Cliff Moore Jeffrey E. Jeter Brian Bower Professional Gunsmithing Rimfires Brian Bower Derek Taylor Joe Goodale Doug Marshall Matthew Gwinner Mark Page Michael Winterberg Jim Akers Neil Raskin Welding Adam Lannon Kenneth Elmer Robert Phillips Michael Dupuis Remington 760 Gamemaster continued . . . Machine Shop Theory Thomas Brooks, Jr. Glenn Morefield Louis K. Merrick Jerry Spadorcio Law Enforcement Armorer Nathan Walraven Mark Brown James Leroy O'Neal Shawn D. Thatch James Long Thomas Brooks, Jr. Firearms Appraiser Kenneth F. Pruski William Thornton Green Dale Bocker Royce Pritchard Joseph L. Cook Scott. A. Denison David Dautel Practical/Hobby Gunsmithing Drake E. Fox Gary Baber Jeffrey Utter Wayne Carter Mac Mcquilkin Don Williams Roy Hawkins John J. Meholczo George D. Main Cowboy Action Armorer Dennis W. Taylor Gib Horton Brian Huss Thomas Tveit Kenneth Bailey Craig Speirs Congratulations! bump into the shelf on the disconnector and the trigger is disconnected. The sear is free to catch the hammer again. If you are getting misfires, you should check the length of the hammer’s power stroke. A longer power stroke will impart more energy to the hammer to fire the primer. The trigger and the connectors are restricted parts, so work on them carefully. The safety is a pin that blocks the back of the trigger. The engagement of the sear to the hammer is conventional. Bob Dunlap shows us the Doing a trigger job would involve trigger group from a 760 rifle adjusting the hammer’s notch rather than the sear. Altering the sear will change the sear’s position in the gun and it might not reconnect. The engagement of the sear to the hammer should be slightly positive. De-creeping the trigger may not lighten the trigger pull much, but it will make the pull feel smoother. The sear spring must have closed ends or it could fall off the sear and/or trigger when the gun is cycling and then the gun will not cock. To lighten the trigger pull, Remington will pound the sear spring to coil bind it. This will make the spring weaker, thus lightening the pull. The Dunlap method is to use a band sander to sand the coils of the sear spring down and reduce its diameter. This will make it weaker and lighten the trigger pull. The trigger pull should not be less than 4.5 pounds, anything less can be unsafe. I am a big fan of the Remington 870 pump shotgun for a home defense gun and I like the idea of including a 760 (chambered in .30-06) for perimeter defense, as all of the same motor skills you train for the shotgun, transition to the rifle effortlessly. I could use my Remington 700 bolt action rifle (also in .30-06) for even further distances. While I'm on a roll, I might as well suggest a Remington R1 1911 style pistol for up close and personal encounters. I enjoyed shooting the 760 very much, though I am left handed and a Monte Carlo comb on a right handed stock tends to tear my cheek up a bit. With a standard Remington butt stock, I would take this rifle with me when I go hiking around home, as my home is also home to bears, mountain lions, bobcats, and coyotes. I surely wouldn't mind using a 760 for a deer rifle, especially in .30-06. The pump action would be great for quick follow up shots if needed. There aren't too many firearms that I don't like, but after shooting the 760, this rifle has moved up a good few notches on my want list! 13 Resource Directory Issue #96 Watkins Tool and Supply 80% AR Lowers and Tool/Fixture Kit 3851 Revere Street, Denver, CO 80239 (303) 371-2298 • www.watkinstooling.com Aquamira Technologies, Inc. Emergency Water Purification Drinking Straw 917 West 600 North, Logan, UT, 84321 (360) 306-5586 • www.aquamira.com ProMag Industries Polymer Mini-14 Magazine 3 N. 48th Avenue, Phoenix, AZ 85043 (800) 438-2547 • www.promagindustries.com Target Vision Remote Wireless Spotting Camera System P.O. Box 60, Fairfield, CT 06824 (888) 322 4370 www.targetvisioncam.com Dillon Precision Products 10-8 Performance Armorer Tool, “Bomber” Shooting Glasses 8009 East Dillon’s Way, Scottsdale, AZ 85260 (800) 223-4570 • www.dillonprecision.com Century Int'l Arms, Inc. Zastava M92 Pistol 430 South Congress Avenue, Suite 1 Delray Beach, FL 33445 (561) 265-4530 • www.centuryarms.biz Chiappa Firearms MC 27 Semi Auto Pistol 6785 W 3rd Street, Dayton, OH 45417 (937) 835-5020 • www.chiappafirearms.com 14 The Dealer Show Room – John Bush Huge Stock of Military Gun Parts, Accessories & Books from the 20th Century 553 Market Street Klamath Falls, OR 97601 (541) 882-4249 www.TheDealerShowroom.com Email: [email protected] Holland Shooters Supply Holland’s Precision Primer Seater, Custom Riflesmith, Remington Accuracy Parts, Long Range Shooting School 711 Avenue H Powers, OR 97466 (541) 439-5155 • www.hollandguns.com 4D Reamer Rentals- Fred Zeglin Hawk Cartridges Book, Chambering Reamers, Bolt Handles, Extensive Line of Custom Gunsmithing Tools & Parts 432 East Idaho Street Suite C420 Kalispell, MT 59901 (406) 752-2520 • www.4-dproducts.com Joe Alesia AKA “Lefty Longridge” Next Level Shooting Clinics – Cowboy, IDPA/IPSC (661) 373-2709 • www.deadwoodboys.org [email protected] Shuey Custom Gene Shuey, Master Gunsmith Ultra Custom 1911 & Glock Pistols 21 Cygnet Dr. #200, Carson City, NV 89706 (775) 246-7662 • www.shueycustom.com Henry Repeating Arms Lever Action .22 Rifles 59 East 1st Street, Bayonne, NJ 07002 (201) 858-4400 www.henryrifles.com AGI The American Gunsmithing Institute Hobby and Professional Gunsmithing Courses 351 Second Street, Napa, CA 94559 (800) 797-0867 www.AmericanGunsmith.com PISCO Gunsmithing Bob Dunlap/Ken Brooks – Gunsmithing 1455B N Hemlock Street, Coquille, OR 97423 (541) 396-5558 • www.piscogunsmithing.com GCA - Gun Club of America 351 Second Street, Napa, CA 94559 (800)-435-GCOA (4262) • Fax 707-253-2150 www.GunClubofAmerica.com Actual size is 1” long Congratulations to the 36 of you who took the time to email me an answer to last month’s question. All 36 were correct that the part is a Bolt Cam Pin for an AR system rifle/carbine/pistol. Congratulations to all of you, although I thought there would have been more of you, given the popularity of the gun involved. We also have first time winners this month. 21 of you were right in that the systems designer was Eugene Stoner. Dang you’re smart! Apologies are in order - we missed this winner last month, Sorry Dr. Dev – Ed. C-96 Movie Role Winner: Devin Southam!!! Last month’s winners are shown below. OK, this month’s part is maybe almost as common as last month’s part, in that it exists in four currently made models of the guns it lives in. With some minor variations it has been around for ~120 years. Can I make it any easier than that? Again, I want the exact name of the part that the manufacturer uses for it, not “square metal thingy.” We’ll give the “Dang Your Smart” $20 credit prize to winners who also know the designer’s first and last name. You can call me with the answer ONLY if: 1. You do not have email access. 2. You call (800) 797-0867, ext.104 between 0800 - 1700 PST Monday - Friday. 3. If you get my voicemail, you leave your name, phone number, and guess. The voicemail time stamps, so be CLEAR with the info. s ' k c Ja Dumb Statement n's h o J 's or n e K h's or t i e of the Month Winner . . . or K NOBODY! HA! We had several of you allege that Mr. Kelly, Himself, actually misidentified a few handguns in one of his SHOT Show segments…Really?! Perhaps, in their excitement, they failed to read the hi-lited sentence below. It is, by definition, impossible that he could be wrong. Obviously the manufacturers of the guns involved somehow mis-stamped those particular guns . . . That’s our story and we’re stickin’ to it! Nobody caught those of us allowed fallibility in an error. Jack is not quite perfect this month, and Ken, John, and Keith . . . well, seriously?? Gene, Bob, Darrell and Mz. Lenée are exempted from the ignominy they and AGI/GCA would suffer in the extraordinarily miniscule possibility that they would actually err. Good luck to all of you in your search this month. Remember, it’s worth $40 to catch one of us, at least if I agree. Remember we’re not talking opinions here, opinions are like noses, everyone is entitled to one. By “Dumb Statement” we mean a real, unnoticed and uncorrected erroneous statement, i.e. saying hammer instead of striker, Colt instead of Smith & Wesson, D/R instead of Bench & Field. Don’t despair, keep looking and listening. *$50 limit Disassembly/Reassembly Video Index DID YOU MISS SOMETHING? Want to order back issues of GunTech? Single issues of GunTech are available for $30 each + $5 shipping. Multiple issues are available in either 6 or 12 month sets. Order your back issues by calling GCA at 1-800-435-4262. Go to www.GunClubofAmerica.com to view the entire GunTech DVD video index of issues and their contents. Firearm . . . . . . . . . . . . . . . . . . . . . . . . . GunTech Volume # Ruger® American Rimfire Rifle®. . . . . . . . . . . . . . . . . . . . . . 95 Dickinson Shotgun . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94 EXCEL Arms MR-5.7 Rifle . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93 Swiss K11 Straight-Pull Carbine . . . . . . . . . . . . . . . . . . . . . . . 92 GSG-MP522 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91 Smith & Wesson SD9 VE Pistol . . . . . . . . . . . . . . . . . . . . . . . . 90 Smith & Wesson Model 422 Pistol . . . . . . . . . . . . . . . . . . . . . 89 Browning BPS Pump Shotgun . . . . . . . . . . . . . . . . . . . . . . . . . 88 Remington Model 6 & Remington Rolling Block . . . . . . . . . 87 Benelli Super Black Eagle & Super Black Eagle II . . . . . . . . 86 Ruger® SR-22® Pistol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85 Armalite AR-30 Rifle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84 Ruger® SR-556® Rifle. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83 Beretta Cougar Pistol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82 Ortgies Pistol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81 Ruger® American Rifle®. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80 Werndl Rifle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79 Colt 1901 DA New Army Revolver . . . . . . . . . . . . . . . . . . . . . 78 Remington 581 Rifle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77 Benelli B80 Lever Locking Pistol . . . . . . . . . . . . . . . . . . . . . . . 76 Darrell Holland's PGW .45 Carbine . . . . . . . . . . . . . . . . . . . . 75 Husqvarna Swedish M-40 "Lahti". . . . . . . . . . . . . . . . . . . . . . 74 Remington 81 Rifle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73 Chiappa .357 Magnum "Rhino" Revolver. . . . . . . . . . . . . . . . 72 Ruger® LC9® and LCP® Pistols . . . . . . . . . . . . . . . . . . . . . . 71 Smith & Wesson Bodyguard 38 Revolver . . . . . . . . . . . . . . . . 70 Interstate Arms Model 99 '87 Coach Gun . . . . . . . . . . . . . . . 69 Heckler & Koch P7 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68 1905 Ross Rifle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67 Smith & Wesson Bodyguard 380 . . . . . . . . . . . . . . . . . . . . . . 66 1907 Winchester Autoloader . . . . . . . . . . . . . . . . . . . . . . . . . . 65 Steyr M9 Pistol. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64 Charter Arms .44 Bulldog Revolver . . . . . . . . . . . . . . . . . . . . 63 Browning Cynergy Shotgun . . . . . . . . . . . . . . . . . . . . . . . . . . . 62 Walther P99 Pistol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61 Sako Model 4 Rifle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60 Smith & Wesson Double Action Revolver . . . . . . . . . . . . . . . 59 Winchester Model 77 Rifle. . . . . . . . . . . . . . . . . . . . . . . . . . . . 58 Walther P22 Pistol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57 Ruger® #1 Single-Shot Rifle . . . . . . . . . . . . . . . . . . . . . . . . . 56 Ruger® LCR® . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55 Beretta 21 Pistol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54 Browning BAR Semi-Auto Rifle. . . . . . . . . . . . . . . . . . . . . . . . 53 Remington 1100/1187 Shotgun . . . . . . . . . . . . . . . . . . . . . . . . 52 NAA Mini-Revolver / Crickett .22 Training Rifle . . . . . . . . . . 51 Savage Model 24. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 Beretta Al 391 Urika Shotgun . . . . . . . . . . . . . . . . . . . . . . . . . 49 Hi-Point Carbine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48 Firearm . . . . . . . . . . . . . . . . . . . . . . . . . GunTech Volume # Walther P-38. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47 Mossberg 500 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46 Hi-Point Pistol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45 Springfield Armory M1-A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44 Browning Citori Shotgun . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43 SIG PRO Pistol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42 Stevens Favorite. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41 Taurus 24/7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 Winchester Model 88 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39 Browning A-Bolt . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38 SIG P-230 Pistol. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 Flintlock/Percussion Lock Mechanism. . . . . . . . . . . . . . . . . . 36 Weatherby Mark V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 1934 Beretta Pistol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 Thompson Contender . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 Winchester Model 62 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 Colt 2000 Pistol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 Charles Daly Shotgun . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 US Revolver Co. Top Break Pistol . . . . . . . . . . . . . . . . . . . . . . 29 Winchester 1885 “Low Wall” Rifle. . . . . . . . . . . . . . . . . . . . . . 28 S&W 41 Auto-Pistol. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 Winchester ‘87 Shotgun . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 Webley Auto Pistol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 Sako Rifle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 Astra 400 Pistol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 MAB Pistol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 Mac 11 Pistol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 Mannlicher/Steyer 1895 Straight Pull Carbine . . . . . . . . . . . 20 Firestar Pistol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 1938 Carcano Carbine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 Tech 9 Pistol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 Dan Wesson Revolver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 Ithaca Model 37. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 1863 Remington Revolver . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Desert Eagle. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Winchester Model 70 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Browning Semi-Auto .22 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Remington 740/742 Rifles . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Colt Python Revolver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Russian Tokarev Pistol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 1874 Sharps Rifle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Mosin-Nagant Rifle. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Mauser C-96 Broomhandle . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Ruger® Model 96™ Rifle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 AMT Automag II Pistol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Russian & Swede Nagant Revolvers. . . . . . . . . . . . . . . . . . . . . 4 Savage 99 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 1912 Steyr Auto-Pistol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Ruger® and its trademarks are the property of Sturm, Ruger & Company, Inc. American Gunsmithing Institute is not affiliated with Sturm, Ruger & Co., Inc. ©GCA, 351 Second Street, Napa, CA 94559, 800-435-GCOA (4262), Fax 707-253-2150, www.GunClubofAmerica.com
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