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The AR-15 (ArmaLite Model 15[8]) is a widely owned[9] semi-automatic rifle, of which the most famous derivative is the selective fire M16-series assault rifle used by the United States military.

Standard AR-15 rifles accept detachable magazines of widely varying capacities (including 10, 20, or 30 round magazines, or 100 round drums), and have a pistol grip that protrudes beneath the stock. AR-15 rifles are highly configurable and customizable. They are commonly fitted with several accessories such as bipods, collapsing stocks, threaded barrels for the attachment of a flash suppressor, and a rail system for the attachment of vertical grips, flashlights, laser sights, telescopic sights and other accessories. The most common bipod is the folding bipod, but there is also a vertical grip with a bipod release. Barrels can come in chrome and stainless steel. The steel barrel tends to be more accurate while the chrome tends to be more durable. It is also possible to use barrels of various rates of twist. AR-15s can also be assembled with a suppressor.



The AR-15 is based on the 7.62 mm AR-10, designed by Eugene Stoner of the Fairchild ArmaLite corporation.[8] The AR-15 was developed as a lighter, 5.56 mm version of the AR-10. The "AR" in AR-15 comes from the ArmaLite name. ArmaLite's AR-1, AR-5, and some subsequent models were bolt action rifles, the AR-7 a semiautomatic survival rifle and there are shotguns and pistols whose model numbers also include the "AR" prefix.[8]

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