The SI Barrel Thread Protector is a machined aluminum thread protector that adds a degree of customization and aesthetics to protect your crown and threads. Whether you are still deciding on a compensator device for your custom pistol, protecting the fine threading of a suppressed barrel, or simply transporting or storage, The SI Pistol Barrel Thread Protector performs a valuable function without sacrificing the looks.FeaturesMachined from billet 6061-T6 AICompatible with live fire 9mm Faceted design for ease of installationIncludes one o-ring