The Carlson's Barrel Remington 870 12 Gauge 3" 18 1/2" Rem Choke Breacher Ramped Front Sight is made for Remington 870 models. All barrels are constructed from certified ordinance grade 4140 steel with chrome lined bores. Vent rib models have a satin matte blue finish with red fluorescent front sight and brass center bead. 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 17-4 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