The Benelli M4 Super 90 (M1014 in USMC service) is the US military's semi-automatic combat shotgun. Uses the ARGO (Auto-Regulating Gas-Operated) system for reliability with different loads. Issued to USMC forces for breaching and CQB. Type: Semi-Auto Shotgun Action: Gas-Operated Caliber: 12 Gauge Capacity: 7 Year introduced: 1999, Italy Weight: 7.8 oz Overall length: 40" Status: Active Military use: Yes Intended use: Military, Law Enforcement, Breaching