The Winchester Super X3 is a self-regulating gas-operated semi-automatic shotgun with 28-inch barrel. Features the Active Valve System that adjusts gas flow to cycle reliably with 2-3/4 through 3-inch loads. Walnut or synthetic stock available. Type: Semi-Automatic Shotgun Action: Gas-Operated Caliber: 12 Gauge Capacity: 4 Year introduced: 2006, USA Weight: 6.75 oz Overall length: 49" Status: Active Intended use: Field, Hunting, Clay Sports