Bill > HB4479

This bill amends Michigan law to establish comprehensive regulations around firearm manufacturing, assembly, and ownership, with a primary focus on requiring serial numbers for all firearms and firearm components. The bill prohibits manufacturing, selling, purchasing, importing, or possessing "ghost gun precursors" (unfinished frames or receivers without serial numbers) and undetectable firearms. Individuals who manufacture or assemble more than 5 firearms per year, use 3D printers or CNC milling machines to create firearms, or manufacture firearms with the intent to sell must obtain a license to manufacture firearms. The law requires that all firearms be imprinted with a valid serial number by a federally licensed gunsmith or manufacturer, and mandates that individuals who manufacture firearms without a license must register their weapon within 10 days and obtain a serial number. Violations are punishable by misdemeanor (first offense) or felony (subsequent offenses) charges, with potential imprisonment and fines. The bill includes numerous exceptions for law enforcement, military personnel, antique firearms, and certain transportation and transfer scenarios. The legislation aims to increase traceability of firearms and prevent the proliferation of untraceable weapons.

Justice

https://legislature.mi.gov/Bills/Bill?ObjectName=2025-HB-4479