The Carlson's Barrel Remington 870 12 Gauge 3" 18 1/2" Rem Choke Cylinder Adjustable Sights are made for Remington 870 models. All barrels 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 rifled model comes with a rifled Carlson choke tube, manufactured from 304 stainless steel, installed. All of their 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