MIL-R-63997B (AMENDMENT 4), MILITARY SPECIFICATION: RIFLE 5.56MM: M16A2 (31 JULY 1993) [S/S BY MIL-DTL-63997C]

MIL-R-63997B (AMENDMENT 4), MILITARY SPECIFICATION: RIFLE 5.56MM: M16A2 (31 JULY 1993) [S/S BY MIL-DTL-63997C]., This amendment forms a part of MIL-R-93997 (AR), dated 12 December 1986, and is approved for use by all Departments and Agencies of the Department of Defense.