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 extractorsTwin action bars and an anti-jam elevator ensure smooth operationPositive steel-to-steel lockupAmbidextrous top-mount safety9-shot models have a convenient cleanout magazine tube cap590 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 kit