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Not sure as I haven't cracked open either gearbox, and I don't plan to unless something either breaks or - more likely - I downgrade one for CQB play. I would have to vote for the CYMA though for reliable internals. Their latest boxes are said to be copies of Systemas, and while I doubt quality is up to the same par they've been running in several different models very well and are well regarded. I am definitely not disappointed with the performance of mine.
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