Let's leave aside the Second Amendment for a moment and examine Article IV. Section 1:
Full faith and credit shall be given in each state to the public acts, records, and judicial proceedings of every other state. And the Congress may by general laws prescribe the manner in which such acts, records, and proceedings shall be proved, and the effect thereof. (emphasis mine)
It sound to me exactly like the proper functions of the federal government under the US Constitution.
I don't think concealed carry is (or should be) a matter of public records; like marriage is. The default condition is a right to keep and bear arms. Do you need a license to practice religion? Speak? Publish? Petition the government?
“’And the Congress may by general laws prescribe the manner in which such acts, records, and proceedings shall be proved, and the effect thereof.’ It sound to me exactly like the proper functions of the federal government under the US Constitution.”
Good argument. Too bad congress didn’t write that into the Constitutional justification.