Quote:
Originally Posted by CDN_Stalker
Best off the top of head guess, your retaining screws holding yoru hop up unit to the receiver are causing problems. Inside the cylinder and itself shouldn't cause the hop up problems you are having, unless your new cylinder isn't compatible with the existing hop up unit.
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Something like what CDN stalker suggested here. Also did you get the PDI cylinder set that is meant for the PDI hopup unit as the cylinder heads for the PDI hopup are slightly longer. I just had an issue with mine after installing a PDI hopup unit I had failure to fires and inconsistant shots due to the original head not being the right length.