Montana is very good. It is one of the six or seven states that got an F from the Brady bunch.
Here is a good summary:
http://www.mtssa.org/shootprivprop.phtml
"...Certainly, the laws of Montana contain many examples of statutes which support the right of citizens to possess and use firearms.
"Also, there are laws restricting firearms possession and use in other states which have not been adopted in Montana, not because they are secret or unknown and not by accident, but because it is not the will of the people of Montana. These restrictions absent in Montana include: No registration of
firearms; no registration of firearm owners; no permits required to buy firearms; no permits required to own firearms; no permits required to possess firearms; no permits required to transport firearms; no permits required to buy ammunition; no storage requirements for firearms or ammunition; no state waiting period for firearm purchase; no limit on the firearms a person may buy in a specified period; no sales tax on firearms or ammunition; no personal property tax on firearms or ammunition; no limit on the number of
firearms a person may own; no limit on the number of firearms a person may keep at home; no "arsenal license" required for storage of multiple firearms; no gun locks required by law; no state background check for firearm purchase; no regulation of private firearm sales between individuals; no legal duty to retreat or flee if attacked; no permits needed to operate a shooting range outside cities; no permit required to carry concealed weapons outside cities;
no licenses, permits or registration to own machine guns; no licenses, permits or registration to own silencers; no restrictions on firearm type or caliber for general game hunting; no regulation of gun shows or firearm sales
at gun shows; no permits for gun shows; virtually no restrictions to shooting on public or private lands outside cities. ..."