MIL-S-63348A (NOTICE-3), MILITARY SPECIFICATION: SUBMACHINE GUN, 5.56MM, PORT FIRING, M231 (26-NOV-2013)
MIL-S-63348A (NOTICE-3), MILITARY SPECIFICATION: SUBMACHINE GUN, 5.56MM, PORT FIRING, M231 (26-NOV-2013)., MIL-S-63348A, dated 18-Aug-1997, remains inactive for new
design; however, the document is valid for use.