6.02 vs 6.03
 

New here. Is there a significant difference in going with either a 6.02 or 6.03 bore barrel for an aeg rifle?

Thanks in advance.

None whatsoever. The quality of the bore is a lot more important than its width. The tightness of the bore will have a small effect on power, tighter being a bit higher power. But, for example, a high quality 6.08 will always outperform a cheaply made 6.02 barrel.