MIL-R-71135, MILITARY SPECIFICATION: RIFLE, 5.56MM: M16A2E3 (19 JUN 1992)
MIL-R-71135, MILITARY SPECIFICATION: RIFLE, 5.56MM: M16A2E3 (19 JUN 1992)., This specification covers a 5.56mm lightweight, air-cooled, gas operated, magazine-fed rifle designed for either full automatic or semi-automatic fire.