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Actually, I think this requires a bit more thought. I've got a P90 and have put a Prometheus MS190 in it. I did this ages ago and if I recall correctly I'd get a higher fps and J with a longer inner barrel (469mm) than with the standard 247mm length (both cases with matching cylinder). And in a way that does make sense.
What I'm trying to say is that you may have problems reaching 600fps with a P90 by its inherent design.You either have to make it into a PS90 or use a different AEG altogether.
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