Latest Airsoft POM piston head from XT.  CNC machined from very strong POM material with an aluminium center thread.  Thread screw is a few mm longer than standard screws allowing you to add AOE shims should you wish.  Comes with a Viton o-ring.

Was tested with 10,000 shots over various builds and showed zero damage. I highly recommend adding a drop of thread-lock on the screw.

Includes thrust bearing.

Weight: 10g