The Benelli M4 Super 90 is a gas-operated semi-auto designed specifically for military and law enforcement, adopted by the U.S. Marine Corps as the M1014 Joint Service Shotgun. Its ARGO dual-piston gas system operates independently of shooter technique, making it the most reliable semi-auto shotgun under adverse conditions. Type: Semi-Auto Shotgun Action: Gas-Operated Caliber: 12 Gauge Capacity: 5 Year introduced: 1998, Italy Weight: 7.8 oz Overall length: 40" Status: Active Military use: Yes Intended use: Military, Law Enforcement, Tactical