Since all of the discussion here has been on the second half of the amendment, I'd like to hear a cogent case for what the pro-gun people believe the first half of the amendment means. Is it germane to its meaning at all? Is it a conditional clause? Is it just a bunch of throat clearing (in which case, why?)?
I think this quote from Noah Webster captures what I think the authors had in mind as they wrote the first clause. Together the first two clauses were their justification for the right that followed.
Well Noah Webster was not involved in writing the Bill of Rights, so I don't know why we should defer to him on the underlying policy, more than anyone else. If that is the underlying policy, that the people must have arms that are more than a match for the regular military, then the people at this juncture need "arms" like jets, and tanks, and maybe nukes for all I know, and certainly need rapid fire weapons.
So perhaps it might be wise and prudent to seek a different spin on all of this, no?