The gun laws in California require state permits and owner's license both for long guns and handguns, however, it is permissible for people to have an unlimited magazine.
State permit required to purchase? Partial Partial All firearm sales must be completed through a dealer. Firearm purchases require a Firearm Safety Certificate and proof of residency unless the individual purchasing the firearm is active duty military, honorably retired military, or a peace officer under Penal Code Section 830. Military reservists must provide proof of residency in order to purchase a firearm. The Firearms Safety Certificate can be purchased and completed at firearms dealers with DOJ instructors on the same day, differentiating it from a FOID or FID card system where one has to apply with the local police and await approval. Must be 21 to purchase any firearm. Owner license required? No No While the Firearm Safety Certificate is required for new purchases of firearms, ongoing possession of a firearm does not require a license or permit. People moving into California are required, within 60 days, to file a New Resident Report of Firearm Ownership. New residents are prohibited from importing assault weapons or any other weapons prohibited by California law regardless of whether they were lawfully acquired and possessed in the residents' prior state of residence. The ban on importing large-capacity magazines was ruled unconstitutional but the ruling is on hold while the case is under appeal. 
