Mossberg 590A1 with XS Tritium ghost-ring sights in 12 gauge with 20-inch barrel. Tritium illuminated night sights. Top-spec tactical pump shotgun. Type: Shotgun Action: Pump Caliber: 12 Gauge Capacity: 8 Year introduced: 2004, USA Weight: 7.5 oz Overall length: 39.5" Status: Active Military use: Yes Intended use: Military/Law Enforcement/Tactical