Quote Originally Posted by scrumpy
I could use a little help with my ULT. It fires as is and works very well, it's walkable. At the field I played at today they were calling questionable because they could "sweetspot" it in the 2-3BPS range. They let me compete though so that was cool. Anyway my problem is when I remove 1 ULT shim it will fire but every 3rd or so shot will be a chuff(even when shooting slow) and the trigger is mushy. I have the most amount of shims that can be fitted in the assembly but any less and it will not fire right - any suggestions?
Check your LX setup (or at least thats what it sounds like). Make sure your on/off is screwed completely ON and your tank is screwed on tightly.

Typical rule for LX tuning is if your marker will not shoot, add a shim to the powertube. If you come to a point where you have 2-3 shims in your powertube and it still doesn't shoot, switch to a larger carrier. When you switch, always start with no powertube shims.