The Mossberg 590 Shockwave is a non-NFA firearm with a 14.375-inch barrel and Shockwave Raptor pistol grip. Classified as a firearm rather than a shotgun due to its overall length of 26.37 inches and non-shoulder-stock configuration. Cylinder bore. Bead sight. Type: Pump Shotgun Action: Pump-Action Caliber: 12 Gauge Capacity: 5 Year introduced: 2017, USA Weight: 5.25 oz Overall length: 26.4" Status: Active Intended use: Home Defense, Tactical, Specialty