Benelli’s M4 Tactical is a unique, Auto Regulating Gas Operated (A.R.G.O) semi-auto shotgun, upon which the U.S. Marine Corps depend. The M4 Tactical comes standard with a Picatinny rail and pistol-grip stock. Other features include a fully-adjustable ghost-ring aperture rear sight and windage-adjustable front sight. New for 2017 the M4 is available with a serious, weather-beating Titanium Cerakote finish. For reliability when it counts, select the M4 Tactical shotgun.