Mossberg 590A1 Special Purpose Parkerized 12 Gauge 3in Pump Action Shotgun - 20in - Mossberg now offers civilians 590A1 Special Purpose models built to the same rigorously-tested specifications demanded by those in uniform. Specifications that include a heavy-walled parkerized barrel, receiver-mounted safety, anti-jam elevator, dual extractors for reliable feeding, and positive shot shell extraction and ejection. Stock choices include a 6-position adjustable tactical stock. Every Mossberg 590A1 Special Purpose model features a drilled and tapped receiver, factory-ready for Picatinny rail, scope base or optics installation. Non-Slip Rubber Recoil Pad Heavy Barrel Fixed Cylinder Bore Bead Sights