Homemade firearms are legally required to be serialized and registered in the state of California.
As of July 1, 2018, prior to manufacturing or assembling a firearm, a person shall apply to the Department for a unique serial number.
Please refer to California Penal Code sections 29180-29184 and the California Code of Regulations, title 11, division 5, chapter 41 (Regulations regarding Identifying Info and the USNA Process and Emergency Regulations regarding Firearms: Identifying Info – Existing and New California Residents) for complete instructions on the process and information regarding firearms that are eligible for a unique serial number prior to starting the application process.
The Unique Serial Number Application shall be submitted via the California Firearms Application Reporting System (CFARS) to request unique serial number(s). Access CFARS at: