MShooter, you are right, nowhere in the constitution is there mention of the regulation of firearms.
Then why is the right given to "the people" instead of a "person" as in the 3rd, 5th and 6th? "The people" are mentioned in the 1st, 2nd and 4th because those rights may not be abridged as a general rule, but may be abridged upon the individual, because of the right of "the people" to security and reasonable order. The Bill of Rights isn't a suicide pact, after all. The 5th and 6th include wording indicating an "hard" individual right with regard to due process in the courts, for example. Wording not present in the 1st, 2nd and 4th. Therefore, while regulation may not be specifically mentioned, it's definitelty implied or the right would have been made "person"al.
So, is this an individual right or does it only apply to the States?
"Congress shall make no law respecting an establishment of religion, or prohibiting the free exercise thereof; or abridging the freedom of speech, or of the press; or the right of the people peaceably to assemble, and to petition the Government for a redress of grievances."