One of the civil rights protected by Concealed Carry Reciprocity is the right to interstate travel. It is "a virtually unconditional personal right, guaranteed by the Constitution to us all," the Supreme Court said in S enz v. Roe (1999). The S enz court explained that travelers have the "right to be treated as a welcome visitor rather than an unfriendly alien when temporarily present in the second state."
The Fourteenth Amendment grants Congress the power to enact a remedy against state mistreatment of interstate travelers.
For example, Illinois prohibits open carry, does not honor concealed-carry permits from any other state, and allows residents of only four other states to apply for an Illinois permit-effectively prohibiting the residents of 45 states from bearing arms within its boundaries.
Even if a court were to hold that the Reciprocity Act is not a proper enforcement of the Second Amendment, the Act would still be valid as enforcement of the right to interstate travel.