Gemtech THREAD PROTECTOR-1/2-28 12222

Gemtech Thread Protector (1/2-28) Caliber Sound Reduction Diameter Length - .41" Weight Mount Material Full Auto Rated Finish For rimfire rifle and pistol, and 9mm handgun applications. These protectors will tighten down easily onto most any appropriately-threaded pistol or rifle barrel, keeping fine threads from being damaged from bumping around gun cases, or when you're not using your suppressor.