Mossberg 590, Shockwave, Pump, 12 Gauge 3, 18.5, Black, 3, 6Rd, Bead Sight, California Compliant 50639 With credentials hard-earned over decades of military and law enforcement use, the 590 Firearm is the perfect choice for your personal and home defense needs. Dual extractors, positive steel-to-steel lockup, twin action bars, and an anti-jam elevator ensure smooth operation.