The Mossberg 590 Shockwave features a 14.375-inch barrel with a bird's-head pistol grip, making it a legal non-NFA firearm as a "firearm" rather than a short-barreled shotgun. Type: Pump-Action Shotgun Action: Pump-Action Caliber: 12 GA Capacity: 6 Year introduced: 2017, USA Weight: 5.25 oz Overall length: 26.375" Status: Active Intended use: Home Defense, Compact