Piston for GM-9, Multimount 9 or TUNDRA LID
An extra LID Piston Core allows you to easily change threads on a TUNDRA or MULTIMOUNT LID to use one suppressor on U.S. standard threaded pistols (1/2-28), European threaded pistols (M13.5x1mm LH), or even 9mm AR-15 carbines (1/2-36 – requires piston blocking tube) . Installs in the field without the use of tools.
LID body, Spring, and Piston Block not included, shown for illustrations only. This is the threaded piston only.
– See more at: https://gemtech.com/piston-for-gm-9-multimount-9-or-tundra-lid.html#sthash.fuj2YcGd.dpuf