The second amendment is contained within the Bill of Rights which applies to all Americans.  The Supreme Court has decided that the 2nd amendment applies to all citizens and not just militias.  It also found that citizens have a right to self defense.  You might not agree, but that is now the law.

So the question is why aren't our constitutional rights granted equally in each state?

In Hawaii I can't get a concealed weapons permit even though i had one on the mainland.  I can't carry a knife either because that is also illegal here.  Without a means of self defense, my rights are being violated by the State.

What if the freedom of the press was regulated like firearms?  That would mean that an article that i could publish in Hawaii could get me arrested in another state?  Does it mean that I would have to get a state license or permit to become a journalist?  Does that mean that i can publish freely in Hawaii but would be limited to 10 articles (weapon magazine limit) in another?