I understand the definition of a submachine gun (an auto carbine that uses pistol ammo).
And of course there are the Thompson Contender (and similar) single-shot guns that fire all sorts of rifle ammo.
But are there semi-auto pistols that fire rifle ammo (like .223 for example)? These would be speciality guns, I think. Made more for "show" than for regular carry, due to the necessary frame size.
Also, is there some sort of requirement that a "pistol" have its magazine inside the grip, or can it be extended from the bottom of the frame? Does having the mag outside the grip somehow change the definition?
Thanks, just curious