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- Is everything in the mechbox stock?
- how used is the gun? ie are you still useing plastic bushings after shooting 10000000 bb's ? worn down bushings will misalign yoru gears and cause them to seize.
- Did you test that your gears are shimmed correctly? Take out the piston and spring, screw the mechbox halfs back together tightly, then try spinning the gears. If they don't move freely, you'll have to re-shim.
- Confirm that the nozzel can move on the piston head freely and the tappet plate is locked into it correctly.
- Confirm that the spring for the tappet plate and switch is installed correctly as sometimes if it's on wrong it can cause binding.
- Is the motor meshed correctly to the bevel gear, and are the gears in good shape or are they stripped/pitted?
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