There's actually a problem here...
MT has always been Open Carry/Lic Concealed.
But there are private businesses that restrict carry. ALL bars, banks, government offices, for starters.
Used to not be a problem... I would go into the back door at the bank, where the security desk is, disarm with their officer, walk on in, do my business, and collect my firearm on the way out. The Sheriff did similar...
Other places, not so much. I think if you are a private or public business and you want to declare your property as requiring no carry. then I think you should have to provide a check-in system, and assume responsibility for the firearm while the gun is in your possession.
I sure don't want to be seen taking off my gun and stuffing it in my car. Sure to get robbed doing that.