The Mossberg 590 Shockwave is a pistol-grip-only pump shotgun with a 14-inch barrel, classified as a non-NFA firearm. The Shockwave Raptor grip is the defining feature, providing control without a shoulder stock. Cycles all 2.75-inch and 3-inch loads. The Shockwave was the category-defining gun that triggered the non-NFA short-pump trend. Type: Shotgun Action: Pump-Action Caliber: 12 Gauge Capacity: 5 Year introduced: 2017, USA Weight: 5.25 oz Overall length: 26.37" Status: Active Intended use: home_defense, novelty, tactical