The Mossberg M590A1 is the US military's standard combat shotgun, passing the demanding MIL-SPEC 3443E testing requirements that no other shotgun met. Features an aluminum receiver, heavy-walled barrel, and bayonet lug. Issued for breaching, guard duty, and CQB. Type: Pump-Action Shotgun Action: Pump-Action Caliber: 12 Gauge Capacity: 9 Year introduced: 1987, USA Weight: 7 oz Overall length: 41" Status: Active Military use: Yes Intended use: Military, Law Enforcement, Breaching