When it comes to detachable magazine pump-action shotguns, the Mossberg 590M has the balance, construction, and a mag durability you need. Along with mag-fed convenience, the 590M features positive steel-to-steel lockup, twin action bars, drilled and tapped receivers, and an ambidextrous safety. 12 Gauge with 10-Round detachable magazine Accessory magazines available in 5, 10, 15 and 20-round capacities Steel ambidextrous magazine release button and housing Stabilizing ribs on the magazine engage the receiver for secure lockup with mounted magazine Drilled and tapped receiver -Standard features include dual extractors, steel-to-steel lockup,top-mounte Mfg: O.F. Mossberg & Sons, Inc.