So if a state repeals the 2nd in their state that supersedes the 2nd of the Constitution? A state can ban all firearms in direct contradiction to the 2nd?
Those of us who favor Subsidiarity would say “yes”, states could in theory ban all guns.
Let’s be consistent and apply Subsidiarity further: I’d prefer counties within to be able to override those states.
Same principle applies to immigration, abortion, same-sex marriage