AR-15 style rifle
An AR-15 style rifle is a lightweight semi-automatic rifle based on the ArmaLite AR-15 design. ArmaLite sold the patent and trademarks to Colt's Manufacturing Company in 1959. After Colt's patents expired in 1977, Colt retained the trademark and is the exclusive owner of "AR-15" designation. The Public Safety and Recreational Firearms Use Protection Act restricted the Colt AR-15 and derivatives from 1994 to 2004, although it did not affect rifles with fewer features.