Military Armament Corporation (MAC) is known for developing the MAC-10 and MAC-11 submachine guns in the 1970s. The MAC-10 is chambered in .45 ACP or 9mm and uses a blowback mechanism, stamped metal construction, and a telescoping bolt. The MAC-11 is a smaller variant chambered in .380 ACP. Neither is currently produced by the original company, but both remain sought by collectors for their historical significance and compatibility with modern accessories such as suppressors and folding stocks.