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if bbs aren't feeding by gravity when you hold the gun upside down, there is an issue with the nozzle or the hopup rubber being in the way. ICSs have weird nozzle lengths, I've workd on 2 m4s that required the metal hopup unit because the plastic one is shit. And on both guns I had to custom sand/lathe an aluminum shs nozzle down to a specific length and cut a bevel into it for it to feed properly.
If you are trying to mix and match on ics exterior parts on an ics upper, you might be making this issue worse. You are in for a world of suck to figure out where it's not working and try to hack a fix to it. I avoid dealing with ics split gearboxes at all costs because the labor rates for troubleshooting would be insanity.
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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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