Someone with any knowledge of the history of the American Revolution, would know that the 13 British colonies that rebelled to form our country were ruled by loyalist British governors - who controlled their militia.
In many colonies armed American revolutionaries had to fight loyalist militias who were fighting with the British army. And in the colonies were colonial militias deserted the Crown in mass to fight for independence, they were no longer legally colonial militias.
Would are founding fathers have forgotten those armed patriots who were not in the militia - but fought the British colonial militias - and deny them the right to bear arms.
http://www.davekopel.org/2A/LawRev/american-revolution-against-british-gun-control.html
Above is a very interesting article on the creation of the first American militia. It arose after the “Powder Alarm” in Massachusetts, about 6 months before Lexington. British General Gage took a bunch of powder from a powder house that he feared would be used by the rebels. (It is believed that if Gage had not taken the powder, the Brits would have lost at Bunker Hill).
After he took it, the locals had a meeting. They disbanded the British militia, and created an American militia. The leaders were still the same people though! They just switched sides! They put together some rules, including training, provision of arms and powder to men too poor to have any, and also created a special division of militia called the Minutemen.
The Congressional Congress down in Philly heard about this and endorsed it, and said all the colonies should support the new militia with money and arms.