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It's practical. 6mm bushings can handle just about anything you throw at it. In fact, that's what everybody was running back in the 90s. They could handle limit-less FPS.
Bushing size only increased because of the "need" to run bearings for increased efficiency and speed. Realizing that 6mm bearings could not handle the loads exerted, 7,8 and 9mm bearings were introduced into the market. And let's face it, it was just an excuse for airsoft manufacturers to sell you more bearings and gearbox shells.
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