This new Benelli M4 (11791) shotgun fires the 12 gauge shell. It has an 18 1/2" barrel with an overall dark brown cerakote finish, other than the black furniture. This semi-auto shotgun has a flat top picatinny receiver rail, rear ghost ring sight, and a rubber pistol grip. It comes with removable choke tube, oil bottle, choke wrench, manual, and box. This Benelli is model #11791.