Did you fail High School Civics?
Federal courts don't "supersede", they interpret and rule on federal issues including the constitutionality of gun laws.
The law is constitutional. Period.
Here is what the most conservative justice on the supreme court said in a major gun law decision:
District of Columbia vs. Heller -
Like most rights, the Second Amendment right is not unlimited. It is not a right to keep and carry any weapon whatsoever in any manner whatsoever and for whatever purpose: For example, concealed weapons prohibitions have been upheld under the Amendment or state analogues. The Court’s opinion should not be taken to cast doubt on longstanding prohibitions on the possession of firearms by felons and the mentally ill, or laws forbidding the carrying of firearms in sensitive places such as schools and government buildings, or laws imposing conditions and qualifications on the commercial sale of arms.
Oh and it should also ban cities,counties,and states from making their own laws on guns as well.
