Considering that Montana Code allows for open carry of loaded firearms by individuals over the age of 14 almost everywhere else in the state, why should this particular piece of State property be any different?
Law-abiding and legal gun owners rarely cause crimes related to carrying loaded weapons.
Many criminals choose to commit violent crimes while carrying loaded weapons, and are most likely carrying concealed without a permit. Criminals will carry loaded firearms whether they are specifically granted a variance or not. Few if any of these scofflaws would congregate openly in public anyway, particularly in broad daylight.