About the Gemtech PISTON GM-45 LID

Gem-Tech PISTON-GM45-1/2-28 GM-45 and Blackside-45 LID Piston Core 1/2-28 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. All options can be installed in the field without the use of tools. 9mm 1/2-28 (for using a GM-45 or Blackside-45 on 9mm handguns)