The constitution is neutral about what kinds of arms we choose to bear.
We citizens, however, seem to have a preconceived notion of which kinds of arms we want to bear.
The debate never seems to get to chemical, nuclear, biological, weapons. No one is advocating we all should be able to buy tanks or aircraft carriers.
The strongest and perhaps most dangerous arms we possess are our minds, which we often choose not to bear at all.
It seems rather that we have a narrow historical view of "the good old days". An imaginary past that we wish to cherish for its strengths and ignore for it failures.