The Remington 870 Marine Magnum with 18-inch barrel, full nickel-plated finish inside and out, and synthetic stock. Designed to resist corrosion in saltwater marine environments. The nickel finish covers the barrel, receiver, magazine tube, and all metal parts. Type: Pump Shotgun Action: Pump-Action Caliber: 12 Gauge Capacity: 6 Year introduced: 1993, USA Weight: 7.5 oz Overall length: 38.5" Status: Active Intended use: Marine, Home Defense, Tactical, Law Enforcement