My M4 setup for Narcos next weekend Learned how to open and tune up the gearbox too.. : r/airsoft

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Alright I opened up my gearbox on its impossible to put back together. I have watched guides and I cannot figure it out. Should I return it and get another aeg and

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My M4 setup for Narcos next weekend Learned how to open and tune up the gearbox too.. : r/airsoft

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