The Mossberg 930 SPX is the tactical variant of the 930 gas-operated semi-automatic platform. It ships with an 18.5-inch barrel, extended magazine tube, ghost ring sights, M4-style pistol grip stock with adjustable length-of-pull, and a Picatinny rail. The 930 uses a self-regulating gas system that handles 2.75-inch and 3-inch shells without adjustment. Type: Shotgun Action: Semi-Automatic Caliber: 12 Gauge Capacity: 8 Year introduced: 2009, USA Weight: 87 oz Overall length: 40.5" Status: Active Intended use: home_defense, law_enforcement, tactical