I used to have double feeding problems on my G36 until i installed a bevel gear with 4 anti-reversal notches rather than 2. It keeps the air seal nozzle from reversing in its cycle, which loads a BB into the hop-up chamber after each shot, which is caused by the nozzle quickly moving back (Momentum carrying it to the next cycle) and then forward (reversing). When you go to shoot again, it starts a regular cycle and chambers a second BB.
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