The ICS m4s seem to have their own measurements... Unless you find the ICS with your exact barrel group and rail system, I'd suggest you go with any other brand.. KA, G&P, vfc.
The only advantage to ICS m4s is their split gearbox... it makes replacing pistons or springs really easy, but not much else.
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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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