But it was still an awkward weapon to fire and was most popular when mated with the efficient Sionics Two Stage Sound Suppressor. to provide a grip strap in front so that a second hand could hold down the gun and control the extreme muzzle climb when firing a long burst. Military due to its small size and high rate of fire (too high it turns out for most operational uses). The MAC-10 didn't generate a lot of interest from the U.S. Military during the final years of the Vietnam War as a weapon for special operations and for support personnel, like armored units (hoping to replace the M3A1 'Grease Gun' Submachine gun as the self defense weapon of most tank crews). 380 ACP version was introduced later in the same year. 45 ACP versions were introduced simultaneously. In 1970, the company Ingram worked for, Sionics Inc, was merged into the larger Military Armament Corporation, and there MAC-10 was put into production.

The Ingram Model 10, better known as the MAC-10, named after its producer Military Armament Corporation, is an American open bolt submachine gun designed by Gordon Ingram in 1965.