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  1. MrKumar1

    Help! CYMA MP5 041J gearbox upgrade

    Fellow airsofters, Can anyone tell me which reinforced or any gearbox will fit in this gun aside from the factory one, as that one keeps braking. I use a strong powered spring about SP150 and it breaks after 6months or so. Which gearbox will (definitely) fit in this gun? I just want one that is...
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