MI HB4456

Expands firearm sale requirements to apply to any "person" selling firearms, not just federally licensed dealers, requiring inclusion of a trigger lock, storage device, or gun case with each sale.

Mandates that firearm sellers provide a free safety brochure with information on firearm use and storage in home environments at point of sale.

Requires both seller and purchaser to sign statements confirming compliance with safety requirements, with sellers retaining signed statements and receipts for at least 6 years.

Protects firearm and ammunition sellers and manufacturers from civil liability for damages arising from firearm use or misuse when sales comply with state and federal law, except for specific contract, warranty, or product defect claims by political subdivisions.

Establishes criminal penalties for violations: misdemeanor for first offense (up to 93 days imprisonment or $500 fine), misdemeanor for second offense (up to 1 year or $1,000 fine), and felony for third or subsequent offenses (up to 2 years or $5,000 fine).