This Genuine Ruger Factory Accessory is compatible with Ruger Semi-Auto Pistols. The factory- manufactured, threaded alloy steel barrel accepts any 1/2''-28 (Class 2A) muzzle device. This kit contains a factory-manufactured alloy steel barrel for optimal fit and function. Installing the threaded barrel is quick and easy with no gunsmithing required. Thread protector, adapter and wrench included.