Mich. Comp. Laws § 750.227c: Transporting or possessing loaded firearm in or upon vehicle propelled by mechanical means; violation as misdemeanor; penalty.

Sec. 227c.

(1) Except as otherwise permitted by law, a person shall not transport or possess in or upon a sailboat or a motor vehicle, aircraft, motorboat, or any other vehicle propelled by mechanical means either of the following:

(a) A firearm, other than a pistol, that is loaded.

(b) A pneumatic gun that is loaded and expels a metallic BB or metallic pellet greater than .177 caliber.

(2) A person who violates this section is guilty of a misdemeanor punishable by imprisonment for not more than 2 years or a fine of not more than $2,500.00, or both.