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Well the bigger your bearings are, the more reliable they will be.
It really comes down to the best brand of mechbox shell and the availability of bearings, Guarder makes a great 6mm bearing mechbox, G&P makes a good 7mm mechbox. As for bearings, well prometheus (best damn bearings I've ever seen in airsoft), makes 6mm and 7mm bearings, but not 8mm as far as i know.
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