GEMTECH Thread Protector M16X1 LH 12225

Gemtech Thread Protector (M16x1mm LH) Caliber Sound Reduction Diameter Length Weight Mount Material Full Auto Rated Finish Thread size - M16x1mm LH For the HK USP Tactical, USP-CT, HK45, HK45c and Factory Glock 21. 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.