MIL-R-12605A, MILITARY SPECIFICATION: RIFLE, 57MM, M18A1 (21-JUL-1972)
MIL-R-12605A, MILITARY SPECIFICATION: RIFLE, 57MM, M18A1 (21-JUL-1972)., This specification covers one type of firearm intended for use primarily as a lightweight, recoilless, manually portable antipersonnel weapon.