MAC-10 (M-10) and MAC-11 (M-11) Trivia and Information


                  Ingram M-10 .45acp                                                                                                   Ingram M-10 .45acp w/ Magazine, Magazine loader

                                                                                                                                                            Cleaning Rod and Fore strap


  Ingram M10 Ingram M11
Caliber  .45ACP and 9x19 Luger 9x17 Browning Short (.380ACP)
Weight  2,84 kg empty 1,59 kg empty
Length 269 / 548 mm 222 / 460 mm
Barrel length 146 mm  129 mm
Rate of fire 1145 (.45) / 1090 (9mm) rounds per minute 1200 rounds per minute
Magazine capacity  30 (.45) or 32 (9mm) rounds 16 or 32 rounds
Effective range  50-70 meters 30-50 meters




                                    Ingram M-10 9mm                                                                                  Ingram M-10 9mm w/ stock extended        

From William D. Ehringer's A MAC History Lesson located at

Manufacturer  Model   Caliber


Military Armament Corp.  M10 9mm open bolt SMG
Military Armament Corp. M10 45acp open bolt SMG
Military Armament Corp. M11 380acp open bolt SMG
RPB Industries M10 9mm open bolt SMG
RPB Industries M10 45acp open bolt SMG
RPB Industries M11 380acp open bolt SMG
RPB Industries M10 9mm open bolt pistol
RPB Industries M10 45acp open bolt pistol
RPB Industries M11 380acp open bolt pistol
MAC, Stephensville, TX M10  9mm open bolt SMG
MAC, Stephensville, TX M10 45acp open bolt SMG
SWD Inc. M11 9mm open bolt SMG
SWD Inc. M11A1 380acp open bolt SMG
SWD Inc. M10 9mm/45 open bolt SMG*
Jersey Arms  M10 9mm open bolt SMG
Jersey Arms M10 45acp open bolt SMG
Erquiaga Arms Co. M10 9mm SMG
Section Five Ltd  M10 9mm British made SMG
Hatton Industries S-701 (MAC-10) 45acp made for Jersey Arms

*SWD purchased frames from MAC, Stephensville, TX (Leatherwood) and built them up using RPB and Cobray manufactured parts.


                                    Ingram M-10 Carbine                                                                    Ingram M-11 .380acp w/ Sionics Suppressor

                            RPB Industries M-11 .380 acp


1. There is no MAC-10.  Its an M-10, originally manufactured by Military Armaments Corporation

2.  There is no MAC-11.  Its an M-11.

3.  All M10s originally submitted to Aberdeen for testing & evaluation had grip safeties. 

4.  All originally submitted were rejected.

5.  The selector was an afterthought! Gordan Ingram made them full-auto only. Jim Leatherwood designed the selector after the fact!  This DID NOT make Gordan happy!!

6.  "The 'Cobray' mark (Logo) is an unregistered trademark, developed by Mr. Wayne Daniels subsequent to his purchase of the Military Armaments Corporation. The 'Cobray' logo is an adaptation of the Snake/World Ingram Company logo which was also an unregistered trademark. The 'Snake/World' logo has been used by everyone who has ever made parts or sold parts for the Ingram, MAC, Daniels, Leinad Cobray style weapons."

7.  Gordon B. Ingram's Middle name?  His friends called him "Bubba".

8.  Posted on MAC-10 Forums, 2-20-2006 by Wildman43: 

SWD mags look like the Walthers, but without pressed "reinforcement" at the feed lips. They are usually thinner guage sheet metal as well. Round sight holes for visually verifying rounds are in the back. Kind of sloppy spot welding down the spine. SWD mags were made by Component Metal Products, as were late RPB Atlanta(Cobray marked) mags. Earlier mags were flat on the front of the mag, later mags have a "bowed" or crowned look to the front of them.

Tony Scherer of Tennessee(Scherer/LaPrade aftermarket Glock mags) may still own the dies for these mags, they were used for M10/9, Tec/KG9 & something else I don't remember. Scherer 36rd mags are distinct in that the sight holes are square & on the side of the mag, kind of like an Uzi mag. Very tight forming work on the bodies, quality looking parts. Based on the Walther MP9 MPL, which appears based upon the Suomi M31 mag.

Original Powder Springs converted Walthers will be marked MPL or MP9 on the LH side, above the floorplate.

Those that can, do. Those that can't, talk about those that do.


9.  The Rates of Fire for the M-10 and M-11:The M-11/380 shoots 1500 rpm

  • The M-11/9s are 1100-1200 rpm. (depending on ammo)
  • The MAC-10/45 goes about 900 rpm. 
  • The MAC-10/9 goes about 800 rpm. 
  •  Registered bolt gun UZIs are faster firing than registered receiver) (Your 9mm MAC-10 may be more like 750 rpm with the heavier bolt.

10.  SWD stand for Sylvia Williams Daniel. NOT Sylvia and Wayne Daniel (from

11.  RPB stands for R. Roby, C. Pitts, & R.W. Brueggemann Industries Incorporated.



From the Myths of the M-11:


M-11s can be fired safely with one in each hand:
On screen nothing is cooler then seeing the hero with a “MAC” in hand cutting down thousands of bad guys. Unfortunately in real life this is not the case. Many new M-11 owners go to the range and try to attempt this feat and find out the hard way that controlling either gun is almost impossible. The movie guns don’t climb because they are using blanks.


M-11s can be fired sideways with one hand
I can’t stand seeing these “gangsters” hold a “MAC” sideways when doing a drive bye. It looks cool but impossible in real life. Many new M-11 owners go to the range and try to attempt this feat and find out the hard way that a FA M-11 will climb up and side ways immediately. The movie guns don’t climb because they are using blanks.


M-11s can be fired one handed with no climb:  
Don’t you just love seeing a bad guy doing 90 mph on a motorcycle firing his “MAC” with one hand while holding it magically on target with ease? Unfortunately many new M-11 owners go to the range and try to dump an entire magazine with out a good grip and find out the hard way that this is impossible. The movie guns don’t climb because they are using blanks.


Gordon B. Ingram, an American arms designer who previously developed several submachine guns under his own name (such as Ingram Model 6), began work on a more compact submachine gun, suitable for clandestine operations, in around 1964. Several prototypes were made by Ingram by 1965, and in 1966 at least one prototype gun was purchased by US Army for test and evaluation. In around 1969 Ingram joined the Sionics Co, which previously manufactured silencers for small arms, and company started tooling up to produce Ingram submachine guns. In 1970 the Sionics was incorporated into larger company Military Armament Corporation (or MAC in short), located in Powder Springs, GA, USA. The same year MAC company commenced production of two versions of Ingram submachine guns - the larger Model 10 (M10), chambered for 9x19 or .45ACP ammunition, and smaller Model 11 (M11), chambered for 9x17 (9mm Short or .380ACP). Either version was available with silencers, developed by Sionics / MAC. The MAC ceased its functioning in 1976, and manufacturing rights for Ingram M10 and M11 submachine guns were transferred to RPB Industries Inc, located in Atlanta, CA. later on, submachine guns and semi-automatic only "pistols" and carbines, based on Ingram design, were  manufactured by several more companies, such as SWD Inc, Cobray, and others. Copies of M10 were manufactured in Taiwan and Japan. Original weapons wee sold to Chile and Yugoslavia during early 1970s; later on, sales were made to some Asian and South American countries.

Ingram Model 10 and Model 11 submachine guns were intended for close encounters and for concealed carry. Several versions of M10 were made with longer barrels, including rare "carbine" version with barrel being about 450mm (18") long, and partially enclosed into perforated barrel jacket. The "civilian" clones of Ingram models were made in a great variety of modifications, with minor differences in almost every detail. Cobray 9mm M11 "pistols", for example, were based on experimental submachine guns developed at RPB Indusries in around 1979; these guns had longer receivers necessary to increase the bolt travel and thus decrease the rate of fire; in semi-automatic versions this feature is, obviously, irrelevant.

Ingram Model 10 is blowback-operated, selective-fire submachine gun, that fires from open bolt. The bolt has firing pin milled in its body (or pinned to it). Bolt is of telescoped design, with most of its weight located in front of the breech face, around the barrel. Cocking handle is located at the top fo the gun, and can be used to lock the bolt in forward position, when handle is turned sideways by 90 degrees. The receiver is made from formed sheet steel and consist of two parts - upper and lower. Receiver parts are connected by steel pin at the front of the weapon. Charging handle is located at the top of the receiver and doesn't move with the bolt when firing. The muzzle of the barrel is threaded to accept silencer. Controls include a manual safety, made in the form of a slider located inside the trigger guard, and a separate fire mode selector, made in form of a rotary lever located on left side of weapon, above the front of trigger guard. The shoulder stock was of telescoped design with folding shoulder rest made of steel wire. To provide additional stability, a leather loop attached to the front of the receiver, which is used to hold the gun by non-firing hand.

Sights are the most simple type, and include non-adjustable diopter type rear and protected front blade.





















Submachine guns "Ingram" MAC-10 and MAC-11 are developed by United States constructor Gordon B. Ingram. Models 10 and 11 differs only in used cartridge type, weight and barrels what is determined by used cartridge type. MAC-10 uses 11.43 mm (.45 ACP) or 9 x 19 mm Para. Modification MAC-11 uses 9 x 17 mm (.380 ACP) this model has smaller dimensions and weight. It was intended for special forces and police. Now it is used by US, United Kingdom, Portugal Armed Forces and a number of Latin-American countries armed forces.

Submachine gun has very technologically simple construction. Its serial production began in year 1970 in Atlanta city. Barrels box is made using stamped steel and has rectangular shape. Automatics work on free lock's returning principle. "Ingram" MAC-10 executes single automatic fire, while MAC-11 only automatic. Its lock has rectangular shape as well and it is covering barrel what allowed to decrease submachine gun's dimensions with the same barrels length. Reloading handle is placed on the barrel's box what allows to reload weapon using any hand. When fire is executed it stays stable.

"Ingram" is reliable because of its heavy barrel and simple construction. It is said that "Ingram" is fully reliable placed for a long time under water. Small dimensions allow to carry it secretly. Well balanced weapon allows executing fire using one hand.

Cartridge-case extraction window is placed from the right side. When fire isn't executed it is closed by barrels frame. "Ingram" has two safety-locks. First serves as reloading handle. It must be turned in 90 degrees to unblock submachine guns lock. When it is turned on there is no clear sighting vision, this signalize that safety-lock is turned on. Second safety switch is placed near the trigger. While it isn't pushed-in lock is also blocked. When barrel is in the front side all openings are closed preventing dirt getting in. Every "Ingram" mechanism stay reliable for a long time and in any conditions opposite to other western weapons.

Magazine is inserted in pistol handle.  It increases weapons balance and allows to execute fire using one hand. "Ingram" MAC-10, 9 x 19 mm para uses 30 rounds magazines. High capacity magazines allow to reach high practical rate of fire. However this factor is a disadvantage at once as submachine gun uses too much ammunition.

Every MAC submachine guns have pulled-off original construction folding butt-stock. It greatly effects on fire accuracy and makes use more comfortable. However such frame butt-stock isn't comfortable enough. However there were developed versions fitted with wooden butt-stock.

Main "Ingram" disadvantages: it is uncomfortable to hold from both hands, as hands are placed nearly, it becomes hard to compensate recoil power and to aim. Joining all the negative factors, they noticeably decrease fire accuracy.

Opened sight is placed on the barrels box. Weather barrel is longer, sight is placed at the end of the barrel. Subsonic bullet's speed made suppressor quiet effective. Both models have barrels screws indented to use the same company MAC suppressor. Models can be fitted with longer barrels and special suppressors. Sound suppressors can be also successfully used as additional handle, increasing fire accuracy as well.


Model "Ingram" MAC-10 "Ingram" MAC-11
Caliber 9 / 11.43 mm 9 mm
Cartridge type 9x 19 mm (Para) / .45 ACP 9 x 17 mm (.380 ACP)
Dimensions and weight
Total weight (with empty magazine) 2 840 g 1 590 g
Overall length 548 mm 460 mm
Length (with folded butt-stock) 269 mm 248 mm
Barrels length 146 mm 129 mm
Fire characteristics
Bullets initial speed 330 / 280 m/s 293 m/s
Rate of fire 1 145 / 1 090 rpm 1 200 rpm
Practical rate of fire 100 rpm 100 rpm
Magazine capacity 30 / 32 rounds 16, 32 rounds
Sighting range 100 m 100 m





Some Company Facts From the Scumbags at the VPC:

According to a 1989 article by Ron Taylor in the Atlanta Journal-Constitution, the history of SWD, Inc. begins in 1978 with the acquisition of Military Armament Corporation's parent company, RPB, and the rights to the MAC-10 fully automatic assault pistol by Wayne Daniel and his partner John Carpenter. Carpenter was soon convicted of trying to bribe a prosecutor to get him to drop a drug charge against a client. Two other partners in the company were accused of smuggling more than two tons of marijuana into Florida. One fled the country; the other was sentenced to 30 years.

Wayne Daniel went on to manufacture a semi-automatic version of the MAC-10, which led to his first confrontation with the federal Bureau of Alcohol, Tobacco and Firearms (ATF). The agency approved the assault pistol, but reassessed its position following reports that it was easily converted to full-auto. In 1982 ATF banned it. Daniel sued and lost. At the end of the dispute, Daniel dissolved RPB and created SWD, Inc. and placed it in the hands of his ex-wife Sylvia. SWD is an acronym for Sylvia and Wayne Daniel.

In 1985 the Daniels were indicted on 12 charges of illegally selling parts to manufacture silencers for submachine guns. The Daniels were eventually fined $1,400 after pleading no contest to misdemeanor charges of not paying proper taxes on the parts.

Ads for the MAC-11 dubbed it "The Gun That Made the '80s Roar." The gun was cheap—$200 to $300—easy to conceal, and could be fitted with a 32-round magazine. SWD also manufactured the Street Sweeper, a 12-gauge, semi-automatic, 12-round, revolving cylinder shotgun—complete with folding stock and pistol grips. One ad for the gun warned, "It's a Jungle Out There! There Is A Disease And We've Got The Cure." For only $395 the ad advised, "Make you [sic] streets safe and clean with the help of 'The Street Sweeper'!"

MAC/SWD/Cobray were sued in 1998 by a man who suffered severe injuries when a shell manufactured and sold by Cobray exploded when the victim fired a MAC/SWD/Cobray flare launcher.



A History and Comparison of MAC-10 models and Manufacturers

Early MAC Serial Numbers

MAC Cook Book

The Old MAC discussion boards:


MACs in Magazines:

Eagle Magazine- The MAC-10

Esquire Magazine- The MAC-10

Gun World Magazine- March 1974

Soldier of Fortune, May 1978

Machinegun News- June 1994

New Breed Magazine

Pistolorero Magazine, December 1980:  Open bolt M-10 Semi & Ops Briefcase

MACs in Movies:

Movies- Posters from John Wayne's McQ


MAC Catalogs:

RPB Catalog

MAC Manuals, How To Pages and Blueprints:

Manuals and Blueprints in PDF format

William Ehringer Slowfire Conversion for M-11

Urbach slow fire bolt for the M11

M-11 TASK Slowfire Conversion from das maschinegewehr MG 08/15 Website

M-11 Troubleshooting Made Easy


The M-10 Operational Briefcase

The Mac in the Anti-gun press

Mitch WerBell Interview- His Saga (in pdf format)


The websites that contributed to this MAC history page!

M-11 owner's website:  This is hte best M-11 resource tha tI have ever found!

Firearms ID page:

Steve's MAC Page:

More MAC stuff:




MAC Trivia: 

3 & 4Wildman43 on Uzitalk





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Last modified: 01/10/10