From NRA-ILA:

Last Friday, July 18, Governor Jerry Brown (D) signed into law anti-gun Assembly Bill 1964.  AB 1964 unnecessarily removes existing exemptions for all single-shot pistols, other than those with a break top or bolt-action, from California’s roster of “not unsafe” handguns.  It is unfortunate that this legislation was passed and Governor Brown signed such a law that does not address any legitimate public safety problems and conflicts with well-established constitutional principles.