I hate the use of the term "common use". What does that have to do with the 2A? If they had applied that reasoning immediately after the 2A went into effect we'd all be carrying muskets and single shot pistols around today instead of AR-15's and semi-auto pistols or instead of revolvers. It's obvious from reading the Federalist papers that the 2A was intended to give us access to military weaponry but thanks to the "progressives" and some RINO's and even the NRA the 2A has been skewed to get around that intent.