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I'm out of my depths here...especially without seeing it first hand.
But...when you're screwing on the outer barrel to the chamber before you insert the hopup unit and inner barrel right?
The tip of the inner barrel can hang up getting into the hole at the end of the outer barrel...and maybe it's jamming it.
Switch back to the stock inner barrel (and stock hopup rubber if you've swapped that too) and reassemble the outer barrel/chamber to see if it fits up properly....at least you'll know that your barrel/chamber combo isn't wonky.
Also...you can fit an o-ring in the groove that you have in the center of your inner barrel and it will assist with centering the inner barrel (and the hopup) with the outer barrel.
Best of luck...please post up what the fix is...
Tys
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