MIL-G-1175B, MILITARY SPECIFICATION: GUN, SUBMACHINE, CALIBER .45, M3A1 (13 MAR 1968) [NO S/S DOCUMENT]

MIL-G-1175B, MILITARY SPECIFICATION: GUN, SUBMACHINE, CALIBER .45, M3A1 (13 MAR 1968) [NO S/S DOCUMENT]., This specification covers one type of fully automatic, air-cooled, blowback operated, magazine fed, submachinegun.