Federal law largely exempts pre-1898 firearms from regulation, on the grounds that these are antique weapons, and not terribly useful to a criminal. This is a bit of an overstatement, but you have to draw a line somewhere between modern weapons and antique weapons.
In the course of my research into knives and the Second Amendment, I found a discussion in David Wong's Knife Laws of the Fifty States of Mich. Comp. Laws sec. 750.222a, which defines a "double-edged, nonfolding stabbing instrument" but does not include "a knife, tool, implement, arrowhead, or artifact manufactured from stone by means of conchoidal fracturing."