ATI Standard Shotgun Heat Shield For 12, 16, 20, .410 Gauge, Black - SHS1300. New interchangeable components fit most popular 12 gauge pump shotguns, Remington 870, Mossberg 500, Winchester 1200, Winchester 1300, Defender, and Maverick. Constructed of formed steel with cooling slots for quick dissipation of heat. Simply slide over the barrel and secure with supplied hardware. Black oxide finish to match shotgun components. This will only fit if the barrel lug is more than 13.5″ from the receiver. Limited Lifetime Warranty