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In HK, the mainstream Mech box mod is to use 8mm bearings for high powered guns.
The large diameter bearing gives both sturctural and friction advantages. Is it common to see guns in excess of 500ft/sec while having 25+ shot/sec.
Of course during the mod, the slightest misalignment will totally ruin the gearbox. I've seen too many DIY failure. Only the most experienced gunsimth will be able to perform such mod.
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