I can't point it out, because you're correct on the 10th Amendment.
You believe that states can violate the 2nd amendment, and prohibit the possession of arms?
But here's one for you: please point out the part of the Constitution that restricts the states from passing sodomy laws, anti-prostitution laws, anti-drug laws, even anti-atheist laws.
The 14th. It requires:
"nor shall any state deprive any person of life, liberty, or property without due process of law."
IE -- Guns are property, & prohibitions on their possession are not due process.
I mean, slavery was Constitutional, wasn't it?
Special case, addressed in Art I, Sec 9. - And you know it.
The states, under the Constitution that you would "live and die for", can ban or allow whatever they wish.
Not true under the constitution, and you SHOULD know that. Curious that you don't.
Why do you reject your own inalienable rights?