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280mm-ish and 363mm-ish...give or take a bit...I think, it was a while ago. I think the CQBR barrel was custom cut to fit and the inner might have been a 390-ish barrel. If I recall correctly the CQB barrel might have been cut back a half inch...and the "long" barrels were a bit longer than a TM M4A1.
I think the cylinders were M4 ported...I think half the setups had Systema silent head setups.
Either way, it was the inner barrel length that made the FPS difference. Sure there's some theoretical differences between mounting each on a different hopup unit, with their own hopup rubber...but the hopup units were the same and so were the rubbers. So for all intents and purposes the only difference was the barrel length.
If you want to test it out, buy a brass M4A1 barrel and cut off 1" at a time. You need to recrown/clean the barrel each time, but it doesn't take long.
Got to pack it in for the night...have fun guys.
Tys
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