This is a Ruger factory replacement barrel. Factory replacement parts are manufactured to the exact same specifications and tolerances and use the same manufacturing materials as the original parts. Ruger 10/22 long rifle barrel is 18-1/2" long with a 1:16" RH twist. Precision-rifled, cold hammer-forged alloy steel barrel features a 1/2"-28 threaded muzzle. .920" barrel diameter at the breach. Barrel is fitted with a .406 high gold bead front sight, a flip-up rear sight assembly and a thread protector. Blued finish.