When the U.S. Marine Corps went shopping for a combat shotgun, they bought a Benelli. That's because a combat shotgun has to function the first time, every time. The Benelli M4 does it for the U.S. military, and now can be the centerpiece of your own home defense plan. Benelli engineers developed and patented a unique Auto-Regulating Gas-Operated (ARGO) system. Dual stainless steel, self-cleaning pistons located just ahead of the chamber operate directly against the bolt assembly. ﻿Chamber pressure is contained by the massive, 2-lug rotary locking head, which locks into the steel barrel extension. The trigger guard and safety are ergonomically designed, blending style and function. Ghost-ring sights allow for quick target acquisition. A Picatinny rail provides for the mounting scopes, sights, and optics. This variant features an A.I. Dark Earth Cerakote finish.