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open the gear box, put in the battery and pull the trigger. do the gears turn at high speed with no signs of struggle? is the sound smooth or rough? from what you say there should be no reason for the gun to function.
if your gears turn fine it's not the locking mechanism. it will be in your upper gearbox. make sure your piston is aligned in the guide grooves and your spring guide is set in it's grooves properly.
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