FX Impact mk11 speed tune help

[Jlacouturec]

Ok I have a impact mk11 22 cal 700mm , 

slug liner. I would like to get the nsa 27gr slugs to 930fps but I can’t. I have everything maxed out , reg 165. Didn’t see much improvement over 150. Telling me the hammer spring is maxed. I did port the barrel 

i can get the 23s to 940ish but not the 27s, there at 890ish.

Any help would be appreciated

check the C3 bumper!!!! maybe you need to replace it!!

 

[Fire_at_will]

The hammer seat could be loose as well.

 

[Heisiam]

hi there

i did the mod heavy was talking about and got them to shoot 940 fps 145 bar reg. 

at 940 i got 1'' groups at 50yds . i slowly tuned down to 925 and getting sub moa groups . Happy with that. thanks you all.