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Your motor height needs to be adjusted. Have you ever taken out the motor or removed the motor plate? If you have make sure there is nothing missing.
On the motor plate you'll notice a an allen screw in the center. Get yourself the allen key and tighten it a half turn, put your gun in semi-auto and pull the trigger. If its grinding, give it another half turn and repeat the process until it sounds right to you. If it starts to click and not cycle, then your motor is too high. If this happens then reverse a quarter turn and test again until it sounds right.
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