Yes, I understand; it just seems like an odd place to draw the line. OTOH, I don't guess too many banks have been held up with cap-and-balls lately.
And of course laws and rulings like this just serve to magnify the point that the law is powerless to affect the behavior of lawbreakers (who aren't already locked up). If an ex-con is going to hold up a 7-11 or off his ex, he's not going to be thinking, I'll get in less trouble if I use my flintlock!
But they don't - and you have proven exactly WHY firearms laws don't work.