Could't you just measure your outer and add whatever needed to reach the hopup and see from there?
It shouldn't be that hard. As for my M4, it came with a 315mm inner; I put a 300mm Prommy in it (315mm length doesn't seem to exist anywhere). But a lot of "short" length are available at varying size, I'm sure you could find a near-perfect fit.
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Quote:
Originally Posted by Brian McIlmoyle
Real life comparison,
GBBR- bang bang -- Giggle
AEG-- merrrzip merrzip -- meh
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