Something I’ve been trying to figure out: why do Grendel AR mags curve like 7.62x39 ones? The Grendel has much less case taper than 7.62x39, and Grendel AK mags look similar to the 5.45 ones (in pics). I would expect Grendel AR mags to look like 5.56 ones, at least superficially. Anyone have some insight on this?