Originally Posted by J Easler
he figured out that the velocity screw was missing and ordered a new one before you responded but thanks anyway.
If the velocity screw is missing, you are going to be shooting HOT... Very HOT!!! Glad you have one ordered, but it's not the issue in this case.
Since it sounds like you have a LOW velocity issue, that could be a few different things:
1. Lack of CO2
2. Worn out main spring
3. Ball detent, in backwards (this is my guess)
4. Bad tank valve or an air restriction issue
Check your ball detent first. If it's in backwards, it blocks the bolt from traveling forward, and prevents a full release of air from the valve. It's an easy (and free) fix, once you figure out how to remove & re-install it, without taking the marker apart.