Semi-automatic rifles able to accept detachable magazines and two or more of the following: Folding or telescoping stock Pistol grip Bayonet mount Flash suppressor, or threaded barrel designed to accommodate one Grenade launcher Semi-automatic pistols with detachable magazines and two or more of the following: Magazine that attaches outside the pistol grip Threaded barrel to attach barrel extender, flash suppressor, handgrip, or suppressor Barrel shroud safety feature that prevents burns to the operator Unloaded weight of 50 oz (1.4 kg) or more A semi-automatic version of a fully automatic firearm. Semi-automatic shotguns with two or more of the following: Folding or telescoping stock Pistol grip Detachable magazine.