I'd go with a 6.03. I went with a 6.01 on my 5-7 (in retrospect a .03 would've probably been safer).. and while I've heard of it but never experienced it, apparently 6.01s can jam.
I've observed in all airsoft that it's not the tightness of the bore that makes the difference, but the quality/consistency of the bore throughout the length of the barrel. You probably won't go wrong with either bore diameter, like I said, I've fielded my 5-7 in dusty/dirty conditions and have yet to have a jam. The fps gain in the 01 would probably be minimal. That legendary TM hop is more than enough to make up for it.
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I futz with V2s, V3s and V6s. I could be wrong... but probably, most likely not, as far as I know.
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