abstract:A semi-automatic rifle is a rifle that fires a single round each time the trigger is pulled, uses gas, blowforward, blowback, or recoil to eject the spent cartridge after the round has traveled down the barrel, chambers a new cartridge from its magazine, and resets the action; enabling another round to be fired once the trigger is depressed again.
The XM29 was intended to be ashoulder-fired, semi-automatic grenade launcher in 20mmcalibreand to incorporateacompact, lightweight 5.56 mmrifleas a back-up weapon.