Do federal felony gun laws supersede state laws?
The first layer is federal gun laws. From there State laws can
restrict gun laws more, but not make them more liberal. From there
County laws/ordinances can restrict more so, but not make them more
liberal.
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Above is correct, but with an exception- Many states have
enacted "preemption" statutes, to prevent a "patchwork quilt" of
gun laws that vary dramatically city to city, county to county. In
those states, the State Legislature preempts the ability of a
county to pass gun laws, reserving that right to itself.