@thackney All 50 states accept my drivers license, marriage, recognize the hunter training I had in NYS to grant me a license in any of them. Why should this be any different?
But none of those items are forced by the feds. If the state chooses to recognize it fine. But you want the feds to force one state to accept the rules and laws of another state?
If California says you can marry your Donkey, should Texas be forced to call that a legal marriage?
If the feds want to enforce the 2nd amendment as written, that would be good. Otherwise, see the 10th amendment.