The Carlson's Choke Tubes 87001 Replacement Barrel is designed specifically for Remington 870 shotguns in 12 gauge with a 24-inch length and ventilated rib configuration.Carlson's Choke Tubes Model 87001 Replacement Barrel12 gauge 24" barrel lengthVentilated rib design for improved heat dissipationMatte finish for reduced glareFiber optic front sight for fast target acquisitionRem Choke configuration with Modified choke includedCompatible with Remington 870 shotgunsIdeal for hunters and shooters looking to upgrade or replace their Remington 870 barrel with enhanced sighting capabilities and reliable choke performance.