This is a new Ruger factory replacement stainless steel barrel threaded for silencer. Factory replacement parts are manufactured to the exact same specifications and tolerances and use the same manufacturing materials as the original parts. This heavy, cold hammer-forged barrel features a recessed target crown and spiral design. .22LR caliber, 1:16" RH twist. This barrel will fit the Standard, Deluxe Sporter, International and Synthetic 10/22 standard barrel contour stocks. 1/2x20 threading.