Gun Control & RKBA

The rights to arms, to bear arms, & the existence of militias, pre-date the document. The Constitution identified and provided new methods for how the Militias were to be regulated, and for the vital roles they were to play in securing our freedoms.
It was these new methods - the powers of the new Congress, that made the people feel the notion of the 2nd was necessary.

[20 Aug. 1789]

Mr. Scott objected to the clause in the sixth amendment, "No person religiously scrupulous shall be compelled to bear arms." He observed that if this becomes part of the constitution, such persons can neither be called upon for their services, nor can an equivalent be demanded; it is also attended with still further difficulties, for a militia can never be depended upon. This would lead to the violation of another article in the constitution, which secures to the people the right of keeping arms, and in this case recourse must be had to a standing army