ARGO (Auto-Regulating Gas-Operated) piston system; the official US Marine Corps service shotgun since 1999. MIL-SPEC tested to 25,000 rounds. Type: Shotgun Action: Semi-Automatic Caliber: 12 gauge Capacity: 5 Year introduced: 1998, Italy Weight: 124.8 oz Overall length: 40" Status: Active Military use: Yes Intended use: military, law_enforcement, home_defense