M129 grenade launcher

M129 Grenade launcher is an American 40-mm automatic grenade launcher. It is weapon for helicopters. It was made in 1966 by the Ford aerospace company and it is still being used today. It is advanced version of the earlier M75. The rate of fire of M75 was 225 rounds per minute, but the M129 can shoot 400 rounds per minute. M129 is used by these helicopters: