RIS II - Daniel Defense

RAIL INTERFACE SYSTEM II [RIS II™] DESCRIPTION
KEY FEATURES
The RIS II™ from Daniel Defense features our patented “Bolt-Up System” which
provides modern flat-top upper receivers with a continuous, uninterrupted upper rail
platform and allows for simplified alignment to the host weapon upper receiver.
Light Weight Free Floating Barrel Design
Steel Barrel Nut
Uninterrupted Upper Rail Platform
Removable Bottom Rail Section
Patented Bolt-Up™ Mounting System
Aircraft Grade Aluminum
Mil-Spec Type III Hard Coat Anodized Finish
Mil-Spec 1913 Picatinny Rails and Fasteners
Every component of the RIS II™ has been meticulously assessed, thoroughly shot
and tested, improved upon, and manufactured tough enough to become the new
benchmark in AR rail systems. In fact, the RIS II™ was selected by SOCOM for the
SOPMOD II program. The RIS II™ also features a removable bottom rail section,
allowing the attachment of the M203 Grenade Launcher.
The Rail Interface System (RIS II™] is specifically designed for those who demand
peak performance.
IMPORTANT NOTE: installation of this product involves modification to your
firearm. If for any reason you are not comfortable performing this work, seek a
competent gunsmith. Read all instructions prior to beginning installation.
TOOLS NEEDED FOR INSTALLATION:
FLAT-TIP SCREWDRIVER
ALLEN WRENCH (supplied)
DD BBL NUT WRENCH (supplied)
REV. 2.0 09.2011
RIS II
™
RAIL INTERFACE SYSTEM II
INSTALLATION INSTRUCTIONS
RIS II™ MODEL:
M4A1
M4A1 FSP
GL/SSC
CONGRATULATIONS!
You have purchased the finest rail system available for your firearm. We have taken
great pride in engineering, designing and manufacturing this product for you, and
we hope you will appreciate the quality of the machining and the finish.
Daniel Defense guarantees every product we make. If for any reason you are not
100% satisfied with any of our products, contact us immediately so that we may
resolve your concerns ASAP. If you ever have any questions or comments about
Daniel Defense or our products, please do not hesitate to call or write.
DANIEL DEFENSE, INC.
101 Warfighter Way • Black Creek, GA 31308
866.554.GUNS (4867) • www.danieldefense.com
GL/SSC FSP
MADE IN THE USA
PATENT# 7,716,865
MK18
MK18 FSP
WARNING
UNLOAD FIREARM BEFORE BEGINNING INSTALLATION
>> Failure to unload the firearm may lead to serious injury or
death! >> Place the weapon on safe. >> Remove the magazine
and cycle the bolt to remove any round from the upper
receiver or chamber. >> Visually inspect the chamber to
make sure it is empty before proceeding with this installation
procedure. >> Be aware that you are solely responsible for
your actions and for your own safety as well as the safety of
those around you.
© Daniel Defense, Inc. All Rights Reserved. Specifications Subject to Change.
NOTE: Prior to performing the following installation, remove flash hider, front sight post/gas block (taper pins drive out from
the ejection port side to the safety selector side), handguard cap and barrel nut. You do not need to remove the barrel.
1. INSTALL BOLT-UP™ PLATE AND BARREL NUT
With the counter-bored side facing the muzzle, slide the RIS II™ Bolt-Up™ plate over the barrel all
the way to the upper receiver. Then slide the barrel nut over the barrel and thread onto the upper
receiver hand-tight. Make sure that the gas tube hole in the RIS II™ aligns with the gas tube hole on
the upper receiver.
Tighten the Daniel Defense RIS II™ barrel nut to 50 ft/lbs using the Daniel Defense RIS II™ barrel
nut wrench. Bolt-Up™ plate will remain loose.
2. ALIGN AND ATTACH RAIL TO BOLT-UP™ PLATE
Note: With the barrel nut and the Bolt-Up™ plate installed properly, the Bolt-Up™ plate will
still move.
Place the RIS II™ over the barrel and mate it with the Bolt-Up™ plate. Insert two screws from the
muzzle end through the rail into the bottom two holes in the Bolt-Up™ plate and hand tighten.
M4A1 FSP ADDITIONAL STEP: Insert the front sight base into the FSP opening on the rail
system, install the gas tube with the gas tube roll pin while the front sight base is inside the
FSP opening. Once the gas tube is installed into the front sight base and inside the FSP opening,
slide the rail system and the FSP onto the barrel as one unit. Stop when the FSP hits the
shoulder of the barrel.
3. TIGHTEN THE RAIL AND REPLACE FSB PINS
Insert the four remaining screws from the breach end of the rifle through the Bolt-Up™ plate
into the RIS II™ and tighten all six screws to 29-32 in/lbs. using the supplied allen wrench in the
following pattern: the center screws first, the bottom screws next, and the top screws last.
Replace taper pins in front sight block if used, reinstall the flash hider.
4. ATTACH LOWER RAIL SECTION
Attach the lower rail section to the upper rail section using the four Lower Rail Attachment Screws.
SPARE LOWER RAIL
SPARE LOWER RAIL
ATTACHMENT SCREW
NOTE: M203 MOUNTING (DD RIS II rails
except the
MK18)
ATTACHMENT
SCREW
1.Remove Lower Rail Assembly by loosening and then removing four (4) Lower Rail Attachment
Screws. Place two (2) of the Lower Rail Attachment Screws back into Lower Rail Assembly for
safe keeping.
2.Locate M203 Hanger Tabs inside Upper Rail Assembly, and rotate downward.
3.Install M203 Grenade Launcher by placing M203 Grenade Launcher engagement collar around
M4 Barrel, ensuring that M203 Alignment Roll Pin is in line with RIS II Upper Rail Assembly
Alignment Slot.
4.Once M203 Grenade Launcher is seated properly, align M203 Hanger Tabs with the forward
threaded holes on the M203 and install two (2) Lower Rail Attachment Screws through the tabs
into the M203.
SPARE LOWER RAIL
ATTACHMENT SCREW
CONGRATULATIONS!
By following these simple instructions, you have now successfully installed
the finest free floating rail system available for your AR15-style rifle.