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yes.. it is a complicated gun.. not sure it is a good design... I expect more problems.. with dual reg design.

not a pretty gun (in fact a bit ugly), 2nd reg means another possible point of failure...not sure about this one.

@Spierings yes, I saw this one before.. that would be the next step if I ever needed more power...😃

these sites have them. you probably want to double check if they are 57mm.. https://www.huma-air.com/FX-Impact-Tuning-Hammer-Spring https://spares.bagnallandkirkwood.co.uk/product/part-c7-fx-impact-hammerspring/

yes.. I also have the huma tp and prob installed on my impact 700mm .30 barrel kit. at 130 bars, it shoot at 978 fps (after replace 52 mm with 57mm spring) with 44.75 grain jsb pellet. it has 95 fpe, 129 joules. it seems powerful enough for me 😄... at this stage.. I only want to shoot 43 grain...

thanks all! after changing back to my old 57mm spring. my reg pressure is set at 130 bars, max out tension spring, I am able to push 44.7 grain jsb exact, at 978 fps with 45 fps increase from 52mm spring..😃 now I am more confident that I am able to push middle weight slug at around 930 - 950 fps...

@Glem.Chally I probably ask too much, might be over the limit of what impact can do..😄.. I might end up with 47, 49, 51 grains range.. I like the speed.. so i might need to go down with slug weight. I am new to slug, I like the performance of slug with windy condition. pellet seems just cannot do...

@Butch thanks! that seems to be a common advice to use the old hammer spring 57mm..

@Leon83 I understand.. but my issue is: increasing reg pressure does not increase velocity. I first want to reach my desired fps range for my slug hopefully, then I can fine tuned it to make it more efficiently.. currently I simply cannot reach to the 960 fps range with my desired slug e.g. 61...

Thanks Grant! I suspect the valve was not opening big enough, with higher pressure, making it even more difficult. so indeed higher tension on hammer spring or hammer weight.. on that direction...I just hoped it could work when installed... apparently not..

Hello all, I recently upgrade my FX IMPACT X with power plenum kit and with 700mm .30 barrel. I find out when I increase reg pressure from 125 bar to 135 bar, I actually loose velocity from 933 fps to around 920. I am shooting 44.75 grain jsb exact pellet. I have maxed out tension spring...