‘What instance of “keeping and bearing” does NOT fall within “the right”? ‘
That would depend on the definition of “the right”. My point is that we don’t pay enough attention to that. If we let the other side define it we will be caught short.
It is a natural right. Either provided by natural law (survival of the fittest, etc.) or as I believe (and many of the Founding Fathers, and others way before them) bestowed by our Creator.