In 2025, Maine lawmakers enacted legislation, effective January 2027, to prohibit unserialized firearms, also known as ghost guns.¹ The law prohibits the possession, transfer, or sale of a firearm that has not been imprinted with a serial number, either by the manufacturer or by another federal firearm licensee. For the purposes of the law, “firearm” includes unfinished firearm frames and receivers like those included in ghost gun products.

The statute includes a procedure for privately-manufactured firearms (PMFs) like 3D-printed guns to be serialized in accordance with the law. Under the law, a person creating a PMF must bring the PMF to a federal firearm licensee to be serialized – a process that includes a background check – before the firearm is completed.