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When the gearbox is assembled into the gun, turn it upside down, so you can see the hop-up entry for BBs, and then cycle it once in semi. The air nozzle normal starting position is backed, so it allows 1 BB to enter as soon as the mag is in.
Look carefully to the air nozzle when cycling in semi. If it goes back and then finishes by going forward at the end of the cycling, the anti-reverse could be the problem. This is what I've experience, otherwise I could not help you without having it in my hand. Hopefully it will help you!
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