GEN GM-45 Rear Piston Llid M1

Gemtech Piston for GM-45, Lunar-45 and Blackside-45 LID (M14.5x1mm LH) Caliber Sound Reduction Diameter Length Weight Mount Material Full Auto Rated Finish Thread size M14.5x1mm LH Can also use on 40 caliber and 9mm pistols. All options can be installed in the field without the use of tools.