This brand new Colt M4A1 Carbine (LE6920SOCOM) is a semi-automatic rifle which fires the 5.56mm round. This has a 16" barrel (14.5" with pinned and welded brake) and a matte black finish. This rifle comes with one 30-round magazine, rail covers, vertical grip, box and manual. This rifle is marked "PROPERTY OF U.S. GOVT."