SPEED Airsoft new Externally Tune-able HPA M4 Triggers will bring out the beast in the Polarstar, Pro-Tech, and Wolverine HPA conversion systems.

A perfect trigger for your Polarstar, Protech, or Wolverine system! Tune the semi auto response on your gun to the max with this high quality trigger!

NOTE: The SPEED trigger does not fit the valken v12 engine