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if you take the anti reversal latch and piston out and close the mechbox with all the screws in place, do the gears spin freely?
Is the motor pushed up too high into the gears?
Did you make any changes to the barrel or hopup?
And when you assemble the gun, look down the barrel with a flashlight and see if the air nozzle is centered to the barrel. It's difficult but it can be done.
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