Michigan's Permit to Purchase
No permit to purchase is needed to buy riffles or shotguns. In Michigan it's required to have a permit to purchase when buying a handgun from an individual.
What is Permit to Purchase?
Some states require that a citizen acquires a permit, before they purchase a gun. If it is required, there will be a fee that varies from state to state. Some states also require finger printing, and background checks before issuing the permit.
Other Michigan firearm laws
Compare Permit to Purchase Nationwide