MIL-R-71135 (W/ AMENDMENT 3), MILITARY SPECIFICATION: RIFLE, 5.56MM: M16A2E3 (24 JUN 2011)
MIL-R-71135 (W/ AMENDMENT 3), MILITARY SPECIFICATION: RIFLE, 5.56MM: M16A2E3 (24 JUN 2011)., This specification covers a 5.56mm lightweight, air-cooled, gas operated, magazine-fed rifle designed for either full automatic or semi-automatic fire (see 6.1).