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Possession of Firearms in National Park Units
In areas administered by the National Park Service, an individual can possess a firearm if that individual is not otherwise prohibited by law from possessing the firearm and if the possession of the firearm complies with the laws of the state where the park area is located. 54 U.S.C. 104906.
Also here is the Montana concealed carry law
Last updated January 5, 2023 . Beginning February 2021, Montana no longer requires a permit to carry a concealed weapon in public. Now, the state allows anyone who can legally possess a firearm to carry carry one in public, without a background check.
Same as in Ohio. I actually have a concealed carry permit so I should be good in most states.
You can’t take your firearm into the ranger station, visitors center and some other places.
Also your not allowed to discharge your firearm in the park. If you do you will end up in court and will have to have a good attorney. I read a story about a guy who fired his pistol, he said stop a bear charge. From what I remember he didn’t shoot the bear and he was able to scare it off. This is the reason I really did a lot of sole searching before I made my decision to take my pistol. It’s not like these bears are mauling people left and right but everyone says carry bear spray, they even sell it at the visitor centers at glacier park. It’s like $50 bucks a can. And yes I’ll have the spray along with some others in my group.