Mossberg 590, Pump Action, 410 Gauge, 3 Chamber, 18.5 Cylinder Barrel, Blued Finish, Synthetic Stock, Bead Sight 50700 590 Tactical Shotguns. With credentials hard-earned over decades of military and law enforcement use, the 590 shotgun is the perfect choice for your personal and home defense needs. Features include Dual extractors, positive steel-to-steel lockup, twin action bars, and an anti-jam elevator ensure smooth operation. Top mounted safety provides for ambidextrous operation.