Military Armament Corporation (MAC) was an American manufacturer of small arms, co-founded by Gordon Ingram, an engineer and gun designer, and Mitchell WerBell, owner of SIONICS, which manufactured gun sound suppressors.
WerBell added his patented silencer, manufactured by SIONICs to Ingram's machine pistol design, to create the MAC-10.
The company focused on the military market, and attempted to sell the MAC-10 to the US Army for use in the Vietnam War.
The investors formed a new company, Military Armament Corporation, to make and sell this weapon.
It stopped producing the firearms in 1973, due to internal company politics,[2] and filed for bankruptcy in 1975.