617131a8_it_Requirements___Criminal_Law__Penalties_At_A_Glance
[State] Montana [Laws / Permit Requirements] Legal without major restrictions [Penalties-At-A-Glance] 
It is a misdemeanor to carry a concealed stun gun if it is intended to be used as an offensive, deadly weapon. Penalties include a fine of up to $500, up to six months in jail, or both.
Stun Gun Laws and Permit Requirements | Criminal Law
Penalties-At-A-Glance