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@OP; When you take the gearbox out, you may have to compair the 2. I think the problem may be with the motor and the motor cage housing. The Crossman may have used a different motor setup with the gun. There's no way to know for sure unless you can physically compair the 2 gearboxes.
If you want to fix it, then use any spare gears you have laying around. Platic Walmart M4 gears will work too. Make sure you grease the gearbox well.
The gearbox will be good to use until the point where the box itself fails. Walmart M4 gearboxes bow out in the middle when they finally say "enough is enough".
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