Magazine form follows cartridge form -- the AK-47 has a very curved magazine because the 7.62x39 has a lot of taper to it. 7.62x51 and 5.56x45 have significantly less, and so the straighter mags (if you look at 5.56mm 30 rounders, they're really like two 20 round mags stuck together, rather than the continuous curve required by 7.62x39). The AK-74 has less curve as well, though still more than 5.56x45 STANAG mags.
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