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Try with a stock non-bearing spring guide...if it works...toss the spring guide and/or spring.
I've run into several instances where the spring didn't seem to overlap the bearing spring guide thrust plate...but it did once things got going.
Almost without exception it's been the above issue when it works for a shot or two and then jams almost fully back (some get stuck so hard that you can pull the whole thing out still compressed).
The only exceptions were due to a mis-match between the piston body and rear of the mechbox. The back end of the piston was a little wide and was jamming are the very back position. As a weird thing to do...loosening the rear screws that hold the mechbox shell together allowed it to fire so I wouldn't have to crack it open with the spring fully compressed. Shaving down the back sides of the piston body rails fixed them. Not much...but enough to jam.
Good luck.
Tys
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