Local units of government may not prohibit, register, tax, license, or regulate the purchase, sale or other transfer, ownership, possession, transportation, use, or unconcealed carrying of any weapon.
However, local governments may restrict the firing of guns and the open or unpermitted concealed carrying of firearms in public buildings.
[10] Montana has a number of restrictions on lawsuits against firearms manufacturers, dealers, or trade associations.
[13][14] Effective June 1, 2021, both concealed and open carry are allowed at all public institutions (colleges, universities, etc.).
[15] The law is being challenged by the Office of the Commissioner of Higher Education as a violation of their authority to oversee campus policy.