If you have questions regarding firearms in the State of California, please FIRST refer to the official government websites before consulting other internet information that may be outdated or incorrect.
California Department of Justice Bureau of Firearms: https://oag.ca.gov/firearms
California Penal Code (most of the California statutes regarding firearms are found here): https://leginfo.legislature.ca.gov/faces/codes_displayexpandedbranch.xhtml?tocCode=PEN&division=&title=4.&part=6.&chapter=&article=
California Firearms Summary (updated 2021): https://oag.ca.gov/system/files/media/cfl2021.pdf
Firearm Safety Certificate (FSC) Program: https://oag.ca.gov/firearms/fscpfaqs
FSC Study Guide: https://oag.ca.gov/sites/all/files/agweb/pdfs/firearms/forms/hscsg.pdf?
California Handgun Roster: https://oag.ca.gov/firearms/certified-handguns/search