The Mossberg 590M is the detachable box magazine version of the 590 platform. Accepts 5, 10, or 20-round flush and extended magazines. 18.5-inch barrel with ghost ring sights. Designed for rapid magazine changes in tactical scenarios. Type: Pump Shotgun Action: Pump-Action Caliber: 12 Gauge Capacity: 10 Year introduced: 2019, USA Weight: 7.5 oz Overall length: 38.5" Status: Active Intended use: Tactical, Law Enforcement, Home Defense