Or are you still pushing the same old BS that States aren't subject to Constitutional restrictions and could bring back slavery if the legislature voted to?
What you are pushing isn't Federalism. It's the old Confederation standard that proved unworkable as some States decided it would be fun to restrict the "unalienable Rights of Man" from certain classes of citizen.
What are they overriding?
Art 6, para 2 says the U.S. Constitution is the Supreme Law of the land and that federal laws supercede state laws. California state law is not violating any part of the U.S. Constitution, and does not conflict with any federal law.
The 2nd amendment, whether it protects an individual right or a collective right, still only applies to federal laws, not state laws.
The 9th amendment says that people have rights, but it does not say that either the federal government or the State of California must protect every single one of them.
The 10th amendment says that since the State of California did not cede their police power to the federal government, the state retains that police power.
The 14th amendment says that states shall not deprive any person of life, liberty, or property without due process. California law does not violate any of these areas -- unless you can show me where.
"Shall not be infringed" means by anyone at any level of government."
Oops. No. Every single court in every single case has stated that the second amendment only applies to federal laws, not state laws. State RKBA laws are guided only by state constitutions (unless the law violates some other part of the U.S. Constitution -- like restricting gun ownership to men only).
"Or are you still pushing the same old BS that States aren't subject to Constitutional restrictions and could bring back slavery if the legislature voted to?"
Slavery? No.
"What you are pushing isn't Federalism."
Ah, but it is. Some issues such as slavery, women's suffrage, state religion, restricting the press, and others weren't popular, but they were federalism.