I recently bought a Palmetto State AR-15 that closely resembles an M16 to go along w/ my Colt Law Enforcement AR-15, made when bayonet lugs were briefly banned on commercial models & Colt continued to make them for Law Enforcement, Military and Export. As you can see the Palmetto State rifles are marked “Property of U.S. Govt. M4 Carbine & have a “3 round burst” setting. (The selector will not turn to this setting) Colt marked their AR-15 w/ "Law Enforcement Carbine” on left side & the “restricted” markings on the right side.