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could have installed the spring backwards, most likely it's an air loss. In some guns the hopup needs to be pushed backwards via a spring tightly against the mechbox, the hopup rubber could be torn resulting in loss of air, your air nozzle could be damaged, mechbox could be cracked, or it could be as simple as there being too much grease around your piston head!
If you take your gun apart, remove the cylinder assembly, remove the air nozzle from the cylinder head and plug the hole with your finger, then ram that piston into the cylinder. If it's doing its job, it should go about 3/4" and stop with no leaks, and as long as your keeping constant pressure the piston shouldn't move forward at all.
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