The 590M with the extended 20-round double-stack detachable magazine is the highest-capacity pump shotgun configuration available from any factory. Primarily a demonstration of the platform's capability and a 3-gun competition accessory rather than a practical defensive tool. Type: Shotgun Action: Pump-Action Caliber: 12 Gauge Capacity: 20 Year introduced: 2019, USA Weight: 144 oz Overall length: 40" Status: Active Intended use: 3-Gun Competition, Tactical