The bill amends the Michigan Penal Code by updating several sections related to firearms and their regulation. Notably, it modifies Section 230 to clarify that a person who alters, removes, or obliterates identifying marks on a firearm is guilty of a felony, with penalties including imprisonment for up to two years or a fine of up to $1,000. Additionally, it establishes that possession of a firearm with altered identifying marks is presumptive evidence of wrongdoing. Section 231 is revised to specify that certain individuals, including peace officers and authorized corrections employees, are exempt from specific firearm regulations, while also changing the terminology from "a person" to "an individual" for clarity.

Furthermore, the bill updates Section 237a, which addresses conduct in weapon-free school zones, establishing penalties for various offenses, including felonies and misdemeanors, depending on the nature of the conduct. It also outlines exemptions for specific individuals, such as school employees and licensed concealed carry permit holders, regarding possession of weapons on school property. The bill repeals several sections of the existing law, including Sections 227, 227a, 227c, 227d, 231a, and 234d, streamlining the legal framework surrounding firearm regulations in Michigan.