In 1964, Gordon B. Ingram developed the MAC-10 (Military Armament Corporation Model 10). The MAC-10 is a highly compact, select-fire submachine gun with a reputation for being an extremely reliable and easily manufactured weapon. However, due to its combination of small size and high cyclic rate of fire make it rather undesireable military weapon.
9x19mm Parabellum .45 ACP
The MAC-10 was built predominantly from steel stampings. A notched cocking handle comes out from the top of the receiver. The MAC-10 has a telescoping bolt, which wraps around 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 MAC-10 fires from an open bolt, and in addition, the light weight of the bolt results in a rapid rate of fire. 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. At the suggestion of the United States Army, Ingram added a small bracket with a small strap beneath the muzzle to aid in controlling recoil during fully-automatic fire.