That is absolute nonsense. Go read (among others) the Tenth Amendment. I believe it also says something about powers reserved to “the people”.
The powers not delegated to the United States by the Constitution, nor prohibited by it to the States, are reserved to the States respectively, or to the people.
The Constitution did NOT delegate the traditional state police powers over firearms to the federal government. Now we have various Constitution haters on these threads calling for the federal judiciary to assume those states' police powers for itself.