California Code, Penal Code - PEN § 27530

(1) A firearm made or assembled prior to December 16, 1968, that is not a handgun.

(2) A firearm that is a curio or relic, or an antique firearm, as those terms are defined in Section 479.11 of Title 27 of the Code of Federal Regulations.

(3) A firearm that has been entered, before July 1, 2018, into the centralized registry set forth in Section 11106, as being owned by a specific individual or entity, if that firearm has assigned to it a distinguishing number or mark of identification because the department accepted entry of that firearm into the centralized registry.

(4) The transfer, surrender, or sale of a firearm to a law enforcement agency.

(5) The sale or transfer of ownership of a firearm to a federally licensed firearms manufacturer or importer, or any other federal licensee authorized to serialize firearms.