Gemtech GM-45/blackside Extra Piston for Lid

Gemtech GM-45/blackside Extra Piston for Lid Features: An extra LID Piston Core allows you to easily change threads on a GM-45 or Blackside-45 to use one suppressor on either U.S. standard threaded pistols (0.578-28) or with European (Metric) threaded pistols. Not only does the pistons let you use your suppressors on your .45 suppressor but with their other options you can also use them on 40 caliber and 9mm pistols. All options can be installed in the field without the use of tools. Gemtech GM-45/blackside Extra Piston for Lid Specifications: 0.578-28 Standard (1911 FN FNP-45 Glock 21 Aftermarket S&W M&P45 and others) 0.578-28 Short (Sig P220 Factory Threaded Barrel) M16x1mm Left Hand (Glock 21 Factory Barrel HK USP-T/USP-CT/45/45c) M16x1mm Right Hand (HK Mk23 SOCOM) M14.5x1mm Left Hand 9/16-24 (for use with .40 S&W) 9x19mm: 1/2x28 (for using a GM-45 or Blackside-45 on 9mm handguns) M13.5x1mm Left Hand (for use with European (Metric) threaded barrels)