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An "Assault rifle" is a selective-fire rifle that uses an intermediate cartridge and a detachable magazine. Selective fire means it is capable of burst or automatic fire which classifies it as a machine gun. The Hughes Amendment to the Firearm Owners Protection Act of 1986 banned new production of firearms classified as machine guns.
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An "assault weapons" which are banned or regulated in California, Conneticuit, D.C., Maryland, Massachusetts, Minnesota, New York, Virginia, American Samoa, Northern Mariana Islands, U.S. Virgin islands, and the cities of Denver and Chicago. (Also Hawaii has an assault pistol law and New Jersey has an assault firearm law.) are a semiautomatic (one trigger pull = one pew) firearm with the ability to accept a detachable magazine and two or more of the following:
- a folding or telescoping stock
- a pistol grip that protrudes conspicuously beneath the action of the weapon
- a bayonet mount
- a flash suppressor or threaded barrel designed to accommodate -
- a flash suppressor
- a grenade launcher
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The AR in AR-15 stands for ArmaLite Rifle. Armalite is the small arms engineering company that designed the rifle.
In short, these (Ruger 10-22, Ruger mini 14) are legal, these (Ruger 10-22, Ruger mini 14) are assault weapons which are banned or regulated in some states, municipalities, and territories, and an AR is anything designed by ArmaLite.