While the 2nd A says nothing about any restrictions on firearms, does anyone who really knows about guns know of magazines with that capacity being available? I can’t remember know what the large magazine that was made for the M-15’s capacity was. I just remember some soldiers taping two together so they could be rapidly changed.
M-16? I believe the original magazine was 20 rounds, That was found to be inadequate, so 30 round mags became standard...same as the AK.