Who cares? You buy an AR, you have to buy AR mags. You buy an AK, you buy AK mags. You buy any of myriad rifles, you buy their mags. But you buy a 9mm carbine and suddenly it HAS to use pistol mags? I think people talk themselves into this sort of thing without actually thinking about it. I'm not going to use a carbine with 15rd mags (if given the choice), any more than I'm going to use a pistol with 30rd mags. As I said, it might be a minor convenience for some purposes but in general, I'd rather have a dedicated SMG style magazine. Yes, an rearward angled pistol mag looks goofy coming out of a rifle when the magwell is forward of the grip. Yes, it matters to me. I have both the braced Scorpion and a braced AR pistol and for a pistol cartridge setup, prefer the Scorpion.