. Barrel Length: 18.5 inches
. Overall Length: 40 inches
. Weight: 7.8 pounds
. Capacity: 5+1
. Caliber: 12 Gauge 2.75 and 3 inches
. Action: Semi-automatic gas-operated.
The Benelli M4 was initially designed for the Marine Corps, where it serves as the M1014. The Benelli M4 is a 12 gauge, gas-operated, semi-automatic shotgun designed for tactical applications. The gas system the M4 uses is called the ARGO (Auto Regulating Gas Operated) system. The ARGO system increases the reliability of a shotgun by taking gasses from the further up the barrel than normal. This gives you cleaner gas and less fouling. The ARGO system also implements two pistons that directly contact the bolt.