Mossberg special purpose shotgun provides a modern, state of the art design for the most serious and potentially prolonged defense situations. It features a durable stainless steel finish, black synthetic stock, and a cylinder bore choke. This model has a 20" barrel.Feature: Dual extractors Twin action bars and an anti-jam elevator ensure smooth operation Positive steel-to-steel lockup Ambidextrous top-mount safety 9-shot models have a convenient cleanout magazine tube cap 590 Mariner model has a corrosion-resistant marinecote finish for extra protection in wet weather environments, for flexibility, the mariner comes with both full-length stock and pistol grip conversion kitDETAILS Series/Collection: 590 Mariner Action: Pump Stock Type: Fixed with Pistol Grip Magazine Capacity: 8+1 Caliber/Gauge: 12 Ga Sight: Bead Receiver Material: Stainless Steel Stock Material: Synthetic Barrel Finish: Marinecote Receiver Finish: Marinecote Stock Finish: Black Barrel Length: 20" Chamber Length: 3" Length of Pull: 13-7/8" Overall Length: 41" Weight: 7 lb Safety: Ambidextrous Tang Chokes: Cylinder Bore