Murdock v. Pennsylvania (1943): SCOTUS found "A State may not impose a charge for the enjoyment of a right granted by the Federal Constitution." This means the entire Bill of Rights as opposed to just the First Amendment. It may mean that states requiring the applicant to pay a fee to purchase or possess a gun are retroactively illegal and may be demanded returned, possibly with interest.
https://www.americanthinker.com/arti...itutional.html