In the former U.S. law, the legal term assault weapon included certain specific semi-automatic firearm models by name (e.g., Colt AR-15, TEC-9, non-automatic AK-47s produced by three manufacturers, and Uzis) and other semi-automatic firearms because they possess a minimum set of cosmetic features from the following list of features:
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 (more precisely, a muzzle device which enables the launching or firing of rifle grenades)
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 that can be used as a hand-hold
- Unloaded weight of 50 oz (1.4 kg) or more
- A semi-automatic version of an automatic firearm
Semi-automatic shotguns with two or more of the following:
- Folding or telescoping stock
- Pistol grip
- Fixed capacity of more than 5 rounds
- Detachable magazine