Mossberg 500 ATI Scorpion in 12 gauge with 18.5-inch barrel. ATI tactical chassis with pistol grip, adjustable stock, and quad-rail forend. Type: Shotgun Action: Pump Caliber: 12 Gauge Capacity: 6 Year introduced: 2014, USA Weight: 7.5 oz Overall length: 38" Status: Discontinued Intended use: Tactical