There is one form of gun control that has been effective and stood the test of time: Taxes.

The NFA has been working for almost a hundred years.

If politicians actually wanted to restrict gun ownership (rather than garnering temporary political support via impotent temporary policies the way California does) they’d use the NFA as a template.

As long as it is impossible to get the majority of states to agree to amend the constitution, any policy that infringes on citizens rights to bear arms is temporary at best.

There is decades of precedent in US courts that makes taxes and licensing not an infringement.