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long story short, unless you go with a barrel longer than 450mm you don't need a bore up.
the m4 cylinder is a good idea, but honestly a good 247 is just as good. barrel length doesn't mean as much in airsoft as the straightness/smoothness of the bore. I have a super upgraded p90 with a 247mm barrel that shoots just as accurately as a super upgraded g36 with a 407mm barrel.
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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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