MAC-10

Ingram MAC-10
MAC-10 (.45 ACP) with suppressor and without magazine.
Type	Machine pistol
Place of origin	United States
Service history
In service	1970–present
Used by	See Users
Wars	Vietnam War War on Terror Invasion of Grenada Miami Drug Wars
Production history
Designer	Gordon B. Ingram
Designed	1964
Manufacturer	Military Armament Corporation
Produced	1970–1973
Specifications
Weight	2.84 kg (6.26 pounds) empty without suppressor
Length	269 mm (10.7 inches) with stock removed 295 mm (11.6 inches) with stock retracted 548 mm (1 foot 9.6 inches) with stock extended 545 mm (1 foot 9.45 inches) with stock retracted w/suppressor 798 mm (2 feet 7.4 inches) with stock extended with suppressor
Barrel length	146 mm (4.49 inches)
Cartridge	.45 ACP (11.43x23mm) 9×19mm Parabellum
Action	Straight blowback
Rate of fire	1,250 rounds/min. (9mm) 1,090 rounds/min. (.45 ACP) 1,380 rounds/min. (.380 ACP)
Muzzle velocity	366 m/s (1,201 ft/s) for 9mm 280 m/s (919 ft/s) for .45 ACP
Effective firing range	50 meters (.45 ACP) 70 meters (9×19mm Parabellum)
Maximum firing range	100 meters (for .45 ACP)
Feed system	30-round detachable box magazine (.45 ACP) 32-round detachable box magazine (9×19mm)
Sights	Iron sights

The MAC-10 (Military Armament Corporation Model 10, officially the M-10) is a compact, blowback operated machine pistol developed by Gordon B. Ingram in 1964. It is chambered in either .45 ACP or 9mm. A two-stage suppressor by Sionics was designed for the MAC-10, which not only abated the noise created, but made it easier to control on full automatic (although it also made the gun far less compact and concealable).

The M-10 was built predominantly from steel stampings. A notched cocking handle protrudes from the top of the receiver, and by turning the handle 90° would lock the bolt, and act as an indicator the weapon is unable to fire. The M10 has a telescoping bolt, which wraps around the rear face of the barrel. This allows a more compact weapon and balances the weight of the weapon over the pistol grip, where the magazine is located. The M10 fires from an open bolt, and the light weight of the bolt results in a rapid rate of fire. In addition, this design incorporates a built in feed ramp as part of the trigger guard (a new concept at the time) and to save on cost the magazine was recycled from the M3 Grease Gun. The barrel is threaded to accept a suppressor, which worked by reducing the discharge's sound, without attempting to reduce the velocity of the bullet. This worked well with the .45 ACP versions, as most loads are subsonic already, as opposed to special, low-powered subsonic loads usually required for suppressed 9mm weapons. At the suggestion of the United States Army, the suppressor also acted as a foregrip to inhibit muzzle rise when fired. Ingram added a small bracket with a small strap beneath the muzzle to aid in controlling recoil during fully automatic fire. The original rate of fire for the M10 in .45 is approximately 1090 rounds per minute. That of the 9mm M11/9 is approximately 1250 rounds per minute, and that of the smaller MAC-11 in .380 ACP is 1380 rounds per minute.