Gemtech 8889494 Thread Protector .5-28

Gemtech Thread Protector Black - THDPROT 1/2-28. .. protect your threads. We stock most all standard sizes: M13.5x1mm Left Hand: For Sig P226 HK USP9SD and Smith & Wesson M&P9 SpecOp. 0.578-28: For 1911 Glock 21 (aftermarket) Sig P220 Combat and FN FNP. M16x1mm Left Hand:: For the HK USP Tactical USP-CT HK45 HK45c and Factory Glock 21. 5/8-24 (0.61" long): For use with any rifle that is threaded 5/8-24x.61" 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. Specifications for Gemtech Thread Protector: Manufacturer: Gemtech Color: Black Package Contents: Gemtech Thread Protector What firearm models does the manufacturer say Gemtech Thread Protector is compatible with? The manufacturer suggests that Gemtech Thread Protector is compatible with SIG Sauer P220 Compact 1911 Glock 21 Glock 17 FN FNPGemtech Thread Protector - THDPROT 0.5-28