The M4 Super 90 is the only shotgun in the Benelli lineup that uses a gas-operated system — the ARGO dual-piston design. Adopted by the US Marines as the M1014 Joint Service Combat Shotgun, it is the most militarily proven semi-auto shotgun in history. Type: Shotgun Action: Semi-Automatic Caliber: 12 Gauge Capacity: 5 Year introduced: 1998, Italy Weight: 89.6 oz Overall length: 40" Status: Active Military use: Yes Intended use: Military, Tactical, Law Enforcement