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One way of allowing unfettered/unregulated access to firearms would be to extend the use of UAV's to the continental USA, establishing the sort of Panoptic oversight that Jeremy Bentham talked about.

i.e. you are free to have any sort of weapon, but as soon as you start shooting school children you will be the subject of a hellfire missile strike.

There would of course be some collateral damage, but critically it would not restrict second amendment rights.

And now my humming of the Indiana Jones theme has been replaced by Ride of the Valkyries.