Performance-tested by the USMCWhen the U.S. Marine Corps needed a new and more lethal combat shotgun, Benelli answered the call with their new gas-operated M4. Combining ruthless efficiency, shot versatility, and signature Benelli reliability, the M4 distinguished itself from the competition, and was chosen as the Joint Service Combat Shotgun. This model is the civilian version, with a shortened 5-round tube and fixed stock. Everything else is identical, from the exceptional ARGO (Auto-Regulated Gas-Operated) gas system to the near-bulletproof build quality. If you want the best military-tactical shotgun in the world, your search begins and end with the Benelli M4.1116541660The official combat shotgun of the USMC ARGO: redefining gas system performanceThe ARGO system is a unique, short-stroke, dual-piston design developed to cycle every 2 3/4" and 3" round still in military service without requiring user adjustment. This compact action features dual stainless steel self-cleaning gas pistons located just ahead of the chamber that act directly against rotating bolt, eliminating the need for the complex linkages found in other gas systems. The pistons only move about half an inch to completely cycle the action, making the M4 faster and smoother-running than other autoloaders. And because the gas port is located just forward of the chamber-where the gasses are hotter and cleaner-it results in less fouling and less cleaning.703519i8_tsThe best gas system in the world Features & Benefits703519_UVP_ts Lightweight alloy frame helps keep weight down ARGO (Auto-Regulated Gas-Operated) system is clean, fast, simple, and self-regulating, so it can handle 2 3/4" and 3" rounds of varying power without adjustment Drilled and tapped receiver with Picatinny rail for optics Premium corrosion-resistant Cerakote finish for superior durability Windage/elevation-adjustable ghost ring rear sight/post front sight Pistol grip is made fro