GEMTECH Thread Protector .578-28 12224

Gemtech Thread Protector (.578-28) Caliber Sound Reduction Diameter Length Weight Mount Material Full Auto Rated Finish Thread size - .578-28 For 1911, Glock 21 (aftermarket), Sig P220 Combat, and FN FNP. 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.