All good. I spent a week in Bozeman Montana two years ago and didn't see a gun, so i'm thinking some may not be so concerned about them as there just aren't many visible.
Open carry is legal in Montana for anyone at least 18 years old that can legally own a firearm with several restrictions. The federal minimum age is 18 years old, although 14-year-olds can handle a firearm under direct supervision of a parent or guardian. Some areas are off-limits, including schools and federal buildings.
Concealed carry without a permit is legal outside the official boundaries of towns or cities