Little night reading for you. Good night.
https://en.wikipedia.org/wiki/Federal_Assault_Weapons_Ban
Criteria of an assault weapon[edit]
Under the Assault Weapons Ban of 1994 the definition of "semiautomatic assault weapon" included specific semi-automatic firearm models by name, and other semi-automatic firearms= that possessed two or more from a set certain features:[13]
An Intratec TEC-DC9 with 32-round magazine; a semi-automatic pistol formerly classified as an assault weapon under federal law.
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 mount
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.