.40
You won't find this on the shelf, but I've always thought that a box magazined, short and light carbine ala M1, but in .40 cal, (imagine a streatched 10mm case, or a .30 carbine case in .40 cal) to be an interesting idea. Winchester had a .40 SLR case down the same path I think.
Maybe something on the 7.62x39 case, perhaps you could use AK mags?
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