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An AR-15 style rifle is a lightweight semi-automatic rifle based on the AR Stoner/Colt design. After Colt's patents expired in 1977 an expanded marketplace emerged with many manufacturers began producing their own version of the AR-15 for commercial sale. They are referred to as Modern Sporting Rifles. AR-15 style rifles have become one of the "most beloved and most vilified rifles" in the United States. The rifle has been promoted as "America's rifle" by the National Rifle Association. They are offered in numerous Calibers ranging from Short Range Target/Defense, Hunting, Medium Range or Long Range Precision.