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You should try this.
WARNING: Be sure that your hopup AND innerbarrel are empty.
when the gun is assembled, put your finger into the magwell on the hopup to block the air from this way. Now check if your gun is pushing enough air by placing your hand or a sheet of paper.
If you can feel a bit of air, there's an airleak somewhere. If you can feel a strong push by the air everything is ok (by strong I mean if it can pushes a little bit your skin).
I one saw a gun with hopup problem like this. It wasn't firing, but there was no airleak. I replaced the hopup bucking and rubber, and everything went back ok. With normal bucking, you should be able to put a bb on the hopup, and shoot it with your mouth (with your finger blocking the other part of the hopup).
Maybe it could help, if it doesn't, you should take your gun to a gun doc !
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