Out of curiosity, I looked it up. Evidently you can legally carry a firearm in a national park if you can legally carry one in the state where the park is located.
https://www.nps.gov/articles/firearms-in-national-parks.htm
Two quotes from the link:
“Visitors should not consider firearms as protection from wildlife.”
“ Unless expressly authorized, Federal law prohibits the possession of a firearm or other dangerous weapon in NPS facilities. ”
- Folks need to be aware of that second one. You might be legally able to carry in the park, but walk into an information center and you’ve committed a felony.
The Minute Man Museum in Massachusetts has a no carry sign on the door.
Funny.
Using a firearm in defense of self or others is not illegal in the parks.
There have been more than one court case to this effect.
Instead they push bear spray. Bear spray is not as effective as a handgun when it comes to defending against bears.