If you're upgrading the barrel, ideally stick to 6.03 to 6.05mm
Anything tighter is just increasing FPS slightly and doing nothing for additional accuracy.
The accuracy derived from your barrel comes from the consistency of the bore, not the actual diameter.
One could say the downside to a 6.01 or 6.02mm barrel is that the dirt that accumulates in the barrel will have a more adverse effect on your accuracy than it would in a 6.05
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