Ruger LCP II 22LR Threaded Barrel Kit, 1/2 x 28 RH Threads, Fits LCP II 22LR, This kit contains a factory manufactured stainless steel barrel for optimal fit 90724 This Genuine Ruger Factory Accessory is compatible with the LCP II chambered in .22 LR. The factory-manufactured" threaded stainless steel barrel accepts any 1/2''-28 (Class 2A) muzzle device. This kit contains a factory-manufactured stainless steel barrel for optimal fit and function. Installing the threaded barrel is quick and easy with no gunsmithing required. Thread protector" adapter" red recoil spring and wrench included.