Hk417

[Heavyd]

I have a vfc hk417 set with both genetic fire rates and thinking of hpa conversion and looking for advice 

 

[Kls77]

U have you use polerstar 417 trigger board . Easy to fit . As the 417 has it own trigger that is attached to gearbox . If u just want single only then can get away with wolervine reaper without Fcu as will wire straight to trigger of the 417 .