RIFLE: RADICAL FIREARMS MODEL AR-15, SERIAL NUMBER 23-023251, BLACK (MATTE), YES - INCLUDES ORIGINAL BOX, SEMI - AUTOMATIC, 5.56 NATO, 16 Notes: For sale is a Radical Firearms AR-15 chambered in 5.56 NATO. This rifle is in very good condition and has been well maintained. It functions properly, has a clean bore, and shows only light cosmetic wear from normal use. Chambered in 5.56 NATO, it also accepts .223 Remington ammunition. It is a reliable, accurate semi-automatic rifle that is ready for the range or other lawful use.