Most Small Arms Review readers are familiar with the MAC family of

Most Small Arms Review readers are familiar with the MAC family of submachine guns,
designed by the late Gordon Ingram, and originally mass produced by the Military Armament Corporation during the 1970s. The Model 10, aka the MAC 10, was manufactured
in 9mm and.45 ACP. The Model 11, aka the MAC 11, was a smaller.380 caliberweapon.
Several years after the demise of Military Armament, Wayne Daniel introduced the 9mm
M1lA{ine submachine gun. The M11,Nine was offered in both submachine gun and semiautomatic models. The diminutive guns were sold through Mr. Daniel's company SWD,
and proved to be very popular.
The MACs and Mll,Nine submachine guns, as designed, have a fast cyclic rate from 900 to 1,200 rounds per
The MAC-Walther 9mm magazines have metal followers that are silver in color.
minute. Despite their RPM, the little
guns are amazingly reliable. One key
component of any magazine fed weapon's reiiability is its magazine. For the
Model i0, Mr. lngram chose existing
magazines, which in addition to insuring
reliability reduced manufacturing
costs.
Both the 9mm and .45 caliber magazines
were readily available as surplus. The
management of MAC decided that they
would alter the MAC and magazines, so
that as-issued surplus magazines would
not readily lock into the weapons, more
or less forcing their customers to buy
spare magazines from them.
Model 10/9mm Magazines
For his first 9mm Model 10, Ingram
Small Arms Revlep . Vol. 17, No. 2 . Apr., May, Jun., 2013
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Wsil SAR on line at: www.smallarmsoftheworldcom
magazines were modified
GI surplus. The others
were made by subcon-
used surplus 32-round double-stack,
single-feed British Sten magazines. A1though the questionable reliability ofthe
Sten magazines was known to Ingram,
the magazines were chosen due to the
request of a customer. The deal never
materialized and only a handful of the
Model 10 submachine guns, all 9mm
prototypes, were made that used the
tractor CMP.
Sten magazine.
.45 Caliber magazines for
the MAC 10 (from left)
with 4O-round, 30-round
and 10-round capacities.
Most of the
30-round
The next magazines used for the
Model 10 were those designed for use
with the Swedish 9mm M/45 submachine gun. The 36-round magazines
were procured from the Carl Gustav
plant in Sweden, and then modified by
MAC personnel to fit and function in
Ingram's submachine gun. Because of
the United States' involvement in the
Vietnam War, the Swedish Government
refused to allow further exportation of
the magazites. With the supply of M/45
Gustav magazines cutoff, the Military
Armament Corporation began importing 32-round Walther MPL 9mm submachine gun magazines from Germany.
Slight modifications were made to the
magazines to adapt them for fit and function in the Model 10. The Walther-type
magazines were the primary units MAC
supplied with the majority of their 9mm
submachine guns.
Today, original 32-round magazines
for the 9mm MAC l0 can be difficult to
find and expensive. The double-stack,
double-feed original magazines can be
identifled by the "MP 9mm" or "MPL"
markings located on the left lower side
of the magazine body, a silver-color met-
al follower and an indented vertical rib
on each side that runs the length of the
body. The follower springs are oval or
round in shape. The original magazines
sold by MAC have a high-quality deep
blue finish, and often will be marked
with the word "MAC" over a Cobray
logo with a number or letter underneath.
The markings are generally found on the
front edge of the magazine body. According to original MAC documents, the
letters and numbers were used as con-
trols, while testing magazines of various lots and configurations (feed lips,
springs etc.) and finishes that included
oxide, blue and phosphated.
After the original MAC Corporation
a number of magazines were
manufactured for the 9mm Model 10
folded.
38
Smull Arms Review . Yol. 17, No. 2 . Apr., May, Jun., 2013
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for the .45 caliber round used slightly
grease
gun
A new magazine catch has been
magazines.
M3
modified U.S.
MAC
10 submachine guns chambered
designed (left) to allow the use of modified or unmodified, and less expensive
surplus M3 magazines.
M3 and M3A1 submachine guns, better
known as the "grease gun." Although
the single feed design has often been
criticized, the prototype of the M3 was
one of the few weapons able to pass the
Ordnance Department's grueling mud
and dust test, which led to its eventual
adoption.
For the .45 caliber Model 10, Gordon Ingram chose surplus "grease gun"
magazines,
but MAC
management
wanted them modified so that customers
would have to purchase spare magazines
from the Military Armament Corporation. Unmodified magazines would not
lock up in the Model 10. The government surplus magazines were modified
and stamped with the Cobray logo on
the front edge of the magazine body by
MAC workers. At times when the inexpensive surplus "grease gun" magazines
this period, CMP produced 40 and l0
round capacity magazites for the .45
caliber Model 10. These magazines
have the Cobray on them in varipoints
on the front edge of the magous
will
azine's body. Although they function
satisfactorily, the locally manufactured
magazines were of a lesser quality than
the surplus GI grease gun magazines.
CMP magazines were made from thinner gauge sheet metal and have stress
lines on them from being formed on a
mandrel; the flnish was a dull blue.
SWD also used the Component Metal
Products to produce magazines and related accessories, marketed and sold by
SWD. Products offered by SWD will
usually have the word "Cobray" underneath the Cobray snake logo.
Model 11/.380 Magazines
were not available, the Military Armament Corporation was forced to have the
MAC 10 magazines produced
locally.
This proved to be quite expensive, and
few were made. The locally made MAC
l0l .45 magazines lacked the thick sleeve
around the feed lips fitted on surplus M3
Many magazines for the MACs
were manufactured by the CMP
company. Some had the MACCotrray stamp on them. Magazines
sold directly from Component Metal Products had their stylized CMP
logo on them. (Courtesy Jelf Hooper
collection)
The .380 caliber Ingram Model 11,
aka the MAC 11, manufactured by the
Military Armament Corporation used
proprietary double-stack, single feed
steel magazines. The followers of the
magazines were also made of steel.
submachine guns and associated acces-
Most of the original magazines were
marked on the front edge of the magazine body with the Cobray snake logo,
with the word "MAC" on top and a number underneath. The MAC I 1/.380 mag-
sories. RPB reportedly
azines were made
magazines.
After the Military Armament Corporation bankruptcy, RPB resumed the
manufacture of Model l0 and Model l1
subcontracted
their magazine work out to the Component Metal Products Company. During
in
16- and 32-round
configurations, and have a dull blue
finish. Like most single-feed designs,
Smull Arms Revierp . Vol. 17, No.2 . Apr., May, Jun., 2013
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Wsit SAR on line ul: www.smallarmsoftheworldcom
that manufactures stainless steel replacement feed lips for the Zytel magazines.
The replacement lips are attached to the
inside of the lips by epoxy glue. The replacement steel lips will only work on
magazines that have not already been
damaged by wear. The Zytel magazines
have a plastic cartridge follower and
most have metal floorplates. The
Mll/
Nine magazines all have the SWD-style
Cobray logo with a circle and the word
Cobray at the bottom.
SWD M11-A1/.380 Magazines
The M11-41/.380 submachine guns
produced by SWD were also designed to
use the Zytel magazines. Some of these
magazines were marked o'.380" on the
back of the body. According to Wayne
Daniel, the magazines were exactly the
same as the 9mm Zytel mags.
Mll/Nine
Steel Magazines
There have been several entities offering steel magazines for the Ml l,A{ine
to replace the original Zytel magazines.
Some of these are new manufacture,
while others are cohversions of existing
magazines. The steel replacement magazines are available in several cartridge
capacities.
M1l/l{ine Magazine Conversions
The problems encountered
with
SWD's Zytel magazines created a need
for a steel replacement. Aperfect candidate was those made for the World War
II British Sten submachine gun. Sten
magazines are plentiful and inexpensive;
however the Sten magazines would not
fit into the MllA.iine's magazine well.
To solve the problem a larger magazine
well was designed. The downside of
the conversion was the old magazine
well had to be cut off and the new one
welded to the receiver, creating a semipermanent alteration. In addition to cutting and welding, the firearm had to be
bead blasted and refinished. There are
several companies that will perform the
conversion and offer the Sten magazine
well separately, for those who want to do
their own conversion work. However,
original Sten magazines have a reputa42
Left is a recent RPB manufacture MAC 11 .380 caliber mzgazine, alongside
a 1970s production mag. The new RPB design was made slightly different to
improve reliability. The magazine worked perfectly during testing in an RPB
MAC 11 submachine sun.
SmallArms Review.Yol. 17,No.2. Apn, May, lun,,2013
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SAR on line
sl: www.smallarmsofthewoild.com
Russell at the recent Knob Creek shoot.
The new magazines appeared to be wellmade and difler slightly in appearance
from the original MAC/Walther magazines. Stamped from the original dies,
the RPB magazine body is a dull blue
color and the follower is blued. The
RPB magazines functioned flawlessly
in the test weapon, a 1972 manufactured
Powder Springs Model 10. The good
news for 9mm MAC l0 owners is the
new magazines are affordable and they
work.
More Good News
In addition to the 9mm MAC 10 magazines, RPB is now offering magazines
for the MAC 11/.380 formed on the
The SO-round drum magazine for
the .45 caliber MAC 10 offered by
the BARRELXCHANGE.
original dies. The magazines procured
for testing fit and functioned perfectly.
Like the 9mmmagazines, the .380 mags
are flnished in a dull blue color. One
slight difference is the new manufacture
magazines use a plastic follower. The
magazines are for the .380 caliber Powder Springs MAC ll and RPB MAC
11A1. They will not work in an SWD
M11-A1 originally designed for the Zytel magazines.
For .45 caliber Model 10 owners there
is a replacement magazine catch that allows both MAC modified and unmodified M3 grease gun magazines to be
used. The old catch is easily replaced
by simply removing the rear plastic grip
panel and pushing out the retaining pin.
R&R Distributinq" lnc.
inv .r C!31
**crni.
ianr,.qap::g
sries rnd intormnlion 1.800-550 4CMP
(4?67)
VenCss&636'76 faisinllio.&rc4&_&6-7!
Drum Magazines for the MAC
:n..nlCUP4 ad CMP-tni
ilP.&..p.
Firing a standard capacity box magazine from a MAC-type submachine gun
is a thrilling
-
but brief
-
experience.
For those desiring more firepower, there
have been several high-capacity drums
available for the MAC. Over the years
there have been several companies offering drum magazines. The MAC drums
are conversions of existing drums, originally made for other submachine guns.
One of the most popular drums used for
the conversions are those made for the
9mm Suomi submachine gun. To adapt
the drum to a 9mm MAC, an extension
is needed to feed the rounds up through
the pistol grip. The reliability and quality ofsuch conversions relied on the skill
of the company performing the work.
44
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Small Arms Review . Yol. 17, No. 2 ' Apn, May, Jun.' 2013
1980s ad from
R&R Distributing,
Inc., a division of
Component Metal Products. The
company made a
number of items for
MACs and
firearms.
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