I do not have an opinion either way on the subject, but from my own genealogical study of my ancestors in the late 1700's in America, I would respond to your statement as the following:
“A well regulated militia being necessary to the security of a free state" =
The people were promised in the Federalist by Alexander Hamilton that there would never be a standing army to threaten the states....Therefore each state had militias in each county...The militias existed to protect both county and state. In an article called, The Last Indian Raid on the Virginia Frontier, the county militia went after Cherokee Chief Benge when he scalped an ancestor and stole my ancestral grandmother...I would assume that each man was required to carry a gun at all times as they often had to protect their frontier forts..The authority to carry a gun may have originated with the state, but how the guns were used in defense were the choices of the men..(I assume)
The point that I am making is that the government is stating today that the national, state and local police and the national guard can protect citizens so the right to bear arms under the theory of a well-regulated militia is null and void...Under the original theories developed by the founding fathers this would not be so...Has the US Supreme Court ruled on the issue? It is the source of constitutional interpretation.
People can find more information on the Russell Co. Va website, including the story I cited and the frontier forts...Have a nice day..