level 10 prob

[Psychotron]

ok first of all i have a 68 classic pwr feed
im useing carrier 1.5 2 shims and medium bolt spring
ok when i hold trigger down air leaks out down the barrel what do i do to fix that?
I tried to put the longest spring on and my velocity wouldnt go high enough to be able to cycle so whats wrong their?
also is the white bumper better then the blue one cuz i think im gonna order a couple and i have a black bumber too anyone ever seen one before?
k ty

[athomas]

The higher valve chamber pressure with the level 10 may cause a slight psst once in a while when the trigger is held but it shouldn't be continuous. When you hold the trigger down and it leaks down the barrel usually indicates an on/off problem. Check your on/off o-rings.

If you can't turn your velocity up high enough to fire the gun then you need a new regulator piston assembly.

Most classic valves use a blue bumper but the other colored ones will work. They may be AGD or other manufacturer's products.

[Psychotron]

ty very much im ordering a new reg. piston assembly im gonna get a spring pack too while im at it
anyother things i should get while im at it?