MI HB4144

Creates new criminal penalties for failing to properly store firearms where minors may access them, with misdemeanor charges for basic violations (up to 93 days imprisonment or $500 fine) and escalating felony charges if a minor obtains and discharges the firearm causing injury (up to 5 years), serious impairment (up to 10 years), or death (up to 15 years).

Requires firearms to be stored in locked boxes/containers or disabled with locking devices when unattended on premises where minors are or may be present, with additional options for visitors to store firearms in locked vehicle containers before entering premises.

Mandates federally licensed firearms dealers include a trigger lock or gun case with each firearm sale (with exceptions for police, antique firearms, and buyers presenting their own locking devices), plus free safety brochures, written warnings about storage penalties, and lethal means counseling literature.

Requires dealers to post notices at sales locations informing customers that improper firearm storage is unlawful and maintain signed compliance statements for at least 6 years.

Provides immunity from civil liability for firearms dealers and manufacturers complying with the law, while limiting political subdivisions' ability to sue manufacturers except for contract disputes, warranty claims, or design defects in equipment they purchased.