Sadly it is not possible to actually ban a federal law. Missouri has only banned local law enforcement from enforcing federal gun laws but the ATF can still come after you in Missouri. If all red states passed bills like this, the laws would be harder to enforce, but the ATF could just prioritize going after political dissidents.
I see secession as the only solution, to this problem and others, regardless of how unlikely or difficult it is.
BasedPatriot wrote
Big if true. We need to abolish the ATF and all NFA laws!