The short answer
California treats anyone who moves into the state with a firearm as a "Personal Firearm Importer." Under Penal Code sections 17000 and 27560 you have 60 days to do one of three things.
- Submit a New Resident Report of Firearm Ownership (form BOF 4010A) with a $19 fee to the DOJ Bureau of Firearms;
- sell or transfer the firearm through a California licensed dealer;
- sell or transfer it to a California police or sheriff’s department, after contacting them for instructions first.
Two hard limits apply on the way in. Handguns must travel unloaded in a locked container that is not the glove box or utility compartment. Assault weapons, machine guns, and magazines that hold more than 10 rounds generally may not be brought into the state at all.
This is general information for people planning a move, not legal advice. Firearm law changes, and some of it is in active litigation. Confirm the current requirements with the California DOJ Bureau of Firearms before you load a truck.