GEMTECH GM-45 Rear Piston Lid M16 12191

Gemtech Piston for GM-45, Lunar-45 and Blackside-45 LID (M16x1mm LH) Caliber Sound Reduction Diameter Length Weight Mount Material Full Auto Rated Finish Thread size M16x1mm LH Can also use on 40 caliber and 9mm pistols. All options can be installed in the field without the use of tools.