The right to bear arms is in the Bill of Rights. It doesn’t get much more fundamental than that.
But that doesn’t necessarily mean that it can’t be regulated as in not permitting concealed carry. There is no fundamental right that is a “right” at all times, i.e. the oft used “you can’t yell fire in a crowded theater”, libel, slander, .. the list goes on on every fundamental right.
So I am not arguing the right may not be “there” but the 2nd says absolutely nothing about conceal carry and the right to bear arms CAN be restricted like any Constitutional right. The question is just how much.
So that brings me back to ... SCOTUS will have to find that “conceal carry” is a fundamental right bestowed by the 2nd Amendment before “full faith and credit” applies.