The Mossberg 590A1 is the mil-spec hardened variant of the 590 pump-action shotgun. It meets US military MIL-SPEC 3443E requirements including a metal trigger guard, metal safety button, heavy-walled barrel, and parkerized finish. The 590A1 is the only pump shotgun to pass US military procurement testing and is currently issued to all branches of the US military. Type: Shotgun Action: Pump-Action Caliber: 12 Gauge Capacity: 8 Year introduced: 1987, USA Weight: 87 oz Overall length: 41" Status: Active Military use: Yes Intended use: military, law_enforcement, home_defense, tactical