The letters "AR" in the AR-15 rifle stand for "Armalite Rifle," which is the name of the original manufacturer of the firearm. The AR-15 was first designed by Eugene Stoner in the 1950s for the company Armalite, which was later sold to Colt's Manufacturing Company in the 1960s. The AR-15 is a popular semi-automatic rifle that is used for a variety of purposes, including hunting, sport shooting, and self-defense.
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