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BB not stable on Blue Cylinder

Hirobo oil tube WAS the problem
try to set back to the factory hop up setting and try again with the blue cylinder.
Red c is not suitable for CQB BARREL but if the current setting you feel good, that's good. You just keep it like that.
Because that is your gun, not ours.

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YOU WILL VERY SORRY WHEN GO WITH KSC BBs
bad grouping

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