MIL-S-63348A (AMENDMENT 4), MILITARY SPECIFICATION: SUBMACHINE GUN, 5.56MM, PORT FIRING, M231 (29 OCT 1992) [NO S/S DOCUMENT]

MIL-S-63348A (AMENDMENT 4), MILITARY SPECIFICATION: SUBMACHINE GUN, 5.56MM, PORT FIRING, M231 (29 OCT 1992) [NO S/S DOCUMENT]., This Amendment forms a part of Military Specification MIL-S-63348A(AR), dated 20 August 1981, and is approved for