[Tifosi]

AFA ban status, mag capacity and firearm are irrelevant to each other.
You don't need a pre ban firearm to have and use a pre ban mag.

 

[Tifosi]

You can go to Herb's or wherever right now and buy a brand new post ban firearm that comes with a pre ban mag.
There's AK 30rd hanging out of magwells, there is even a AR retailer that ships a pre ban 20 with thier new off the line rifle.
If you spook enough you can find Glocks, 1911s etc.