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But if the mags were designed for a rifle..... . might be kinda the opposite of the AR mag thing. you'd have to look at the exact wording. which I haven't
That's why I said "easy" answer...as for the right answer, I don't really know. I remember that the CFC actually sent out some kind of notice clarifying the 10 round pistol mag issue, and that the restriction is on the magazine and not the firearm that it was used in.