The Carlson's Slug Barrel Remington 870 12 Gauge 3" 18 1/2" Rem Choke Rifled Adjustable Sights are constructed from certified ordinance grade 4140 steel with chrome lined bores. All 18 1/2" barrels are non vent ribbed and have a ramped front sight with a matte finish. Each barrel comes with a Carlson choke tube, manufactured from 304 high stress stainless steel, installed. All of Carlson's Remington 870 replacement barrels are threaded for the standard Rem Choke system. Enhance the versatility and performance of your Remington 870 12ga shotgun with a Carlson's replacement shotgun barrel. FeaturesFor Remington 870, 12 gauge, right hand only (not tactical)Ships with Rifled Choke Tube