The standard Mossberg 590 with a 20-inch barrel and 8+1 capacity is the workhorse law-enforcement and military support pump shotgun. Heavier barrel than the 500, separate barrel-retention cap, and metal trigger housing distinguish the 590 from the budget-tier 500. Used by the U.S. military and numerous police agencies. Type: Shotgun Action: Pump-Action Caliber: 12 Gauge Capacity: 8 Year introduced: 1961, USA Weight: 120 oz Overall length: 41" Status: Active Military use: Yes Intended use: Military, Law Enforcement, Home Defense, Tactical