The Mossberg 590M is a pump-action shotgun that uses detachable double-stack box magazines rather than a traditional tube magazine. Available in 5, 10, 15, and 20-round magazine capacities, it is designed for users who need rapid reloads without loading individual shells. Type: Shotgun Action: Pump-Action Caliber: 12 Gauge Capacity: 10 Year introduced: 2019, USA Weight: 224 oz Overall length: 41" Status: Active Intended use: Home Defense, Tactical, Law Enforcement