The 590A1 is Mossberg's military-specification pump-action shotgun with a metal trigger guard and safety, a thick-walled barrel, and extended magazine capacity. The most durable Mossberg pump-action produced. Type: Shotgun Action: Pump-Action Caliber: 12 Gauge Capacity: 8 Year introduced: 1987, USA Weight: 7.25 oz Overall length: 38.5" Status: Active Military use: Yes Intended use: Military / Law Enforcement / Home Defense