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take your upper receiver off, cycle the gun so the air nozzle is in the forward position, and check to see if it moves back and forth freely.
If it does not, your sector gear may be shimmed too far to the right and it's pinching the tappet plate.
The problem could be much simpler like an incorrectly installed hop rubber, or your hopup is turned all the way on, or the wrong air nozzle, or you didn't torque things down properly when reassembling the lower receiver so the mechbox is on an angle
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