If you're looking to upgrade you HPA pews semi rate of fire, then you have come to the right product. 

This is by far one of the the best options!

Specs:

• Full CNC aluminium construction
• Set screw to adjust pre-travel
• Precision sear for flawless trigger presses
• Strengthen pivot pin
• Lightweight

Compatible with: 

• Any V2 Gearbox
• For Polarstar, F1, Fusion, Jack HPA Systems. Wolverine Hydra, Inferno HPA engines and Black leaf trigger boards. 

*Please don't over adjust, doing so can damage your trigger boards micro switch.