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You can only get semi auto with the mechbox full and installed. The cut off lever needs to be knocked by the lobe on the sector gear in order to reset the contact/trigger. Get a new piston, put everything back together and try it out as a system, then get back to us. The motor outside of the mechbox (or inside with no piston) will just spin as long as you hold the trigger. And chances are you didn't have the selector plate in the correct position to engage the cut of lever properly.
Get back to us after you complete the mechbox and test it out in the gun.
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