Benelli M4 in good condition. The Benelli(R) M4 Tactical shotgun has been battle-proven for reliability around the world by the U.S. Marine Corps since 1998. The M4 operates by a unique, Auto-Regulating Gas-Operated (A.R.G.O.) system, featuring dual stainless steel, self-cleaning, pistons that bear directly on the bolt assembly. Benelli's ARGO mechanism eliminates the more complicated linkages and heavier parts of other semi-auto shotgun designs to produce a relatively simple and robust action. The auto-regulating gas system is designed to handle everything from field loads to hard-hitting 3" buckshot without the need of adjustments. Firearm is used with signs of use. It comes as is with no box or other accessories. It has an MLok rail installed on the firearm.