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An AR-15–style rifle is a lightweight gas-operated, magazine-fed semi-automatic rifle based on or similar to the Colt AR-15 design. The Colt model removed the selective fire feature of its predecessor, the original ArmaLite AR-15, itself a scaled-down derivative of the AR-10 design by Eugene Stoner. It is closely related to the military M16 rifle. ArmaLite sold the patent and trademarks for both t... Wikipedia