Carlson's replacement shotgun barrels are manufactured of certified ordinance grade 4140 steel and feature chrome lined bores. This 18-1/2" barrel has an extra matte finish and a ramped front sight. This smoothbore barrel ships with a rifled choke tube, constructed of 304 high stress stainless steel. Notes:Barrel will fit magnum and 2-3/4" receiver. Use only 2-3/4" shells when barrel is mounted to 2-3/4" receiver.Will not fit Remington 870 Tactical models