MIL-S-63348A (NOTICE 2), MILITARY SPECIFICATION: SUBMACHINE GUN, 5.56MM, PORT FIRING, M231 (18 AUG 1997) [NO S/S DOCUMENT]., This notice should be filed in front of MIL-S-63348A(AR) dated 20 August 1981MIL-S-63348A(AR) dated 20 August 1981 with Amendment 4, dated 29 October 1992 andValidation notice 1, dated 24 October 1988 is inactive for new design and no longer used exceptfor replacement purposes.