Montana Title 45. Crimes § 45-3-111. Openly carrying weapon--display

(1) Any person who is not otherwise prohibited from doing so by federal or state law may openly carry a weapon and may communicate to another person the fact that the person has a weapon.

(2) If a person reasonably believes that the person or another person is threatened with bodily harm, the person may warn or threaten the use of force, including deadly force, against the aggressor, including drawing or presenting a weapon.