Did you do the shimming or are you using the factory's shim job? I'm asking because if the bevel gear is shimmed too high, you'll get binding on the pinion gear which the gun won't fire. I recommend re-shimming the gears to your motor and grip. When something is too tight, the clicking sound is common. Another tip is to lower the motor height all the way down and slowly turn it up, until you feel resistance. And start your adjustments from there.
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