The fact that not everyone in the USA has the right is pretty well established, such as convicted felons or the mentally disturbed. Also, there is an existing

The fact that not everyone in the USA has the right is pretty well established, such as convicted felons or the mentally disturbed. Also, there is an existing permit system in operation for extending gun rights, such as concealed carry. All a licence would do is codify an expected level of responsibility that already exists anyway in the laws concerning guns. Besides, if someone can't stay within the confines of basic range safety for the hour or so it would take to pass a test, then perhaps they shouldn't have a gun. I accept that the current legal interpretation is not currently in that direction, however I'll also note that it has changed several times and that recent court cases have come out against gun registration, but not as far as I am aware against a gun license being required for purchase, as you are allowed state laws imposing conditions and qualifications on the commercial sale of arms.