2nd Amendment rights refer to the word "arms" which in 1700's included flintlock rifles and cannon. Today it would include all military weaponry including rocket propelled grenades, mortars, and Stinger missiles capable of taking down airliners and 300 souls.
All of these weapons would be required to put down a tyrannical government with access to helicopter gunships, fighter jets, and drones as seen in Syria. Yet, "most of us" agree these weapons do not belong in the hands of the general public. It has been proven that large magazine capacity weapons can easily destroy 30 or more souls, probably more than a grenade or mortar. The question then becomes, what is the number of men, women, and children's lives sacrificed needed to disqualify a weapon for general public access?
In the 1920's and 1930's the Tommy gun (Thompson sub-machine gun) was the favorite of criminals until access to it was eliminated, which turned out to be a fifty-plus year success. Yet we still enjoyed sport shooting and hunting.
As for the idea of overthrowing government as opposed to using the democratic process, remember it was tried in the 1860's with disastrous results.
As a two-tour Vietnam Vet, I've seen how indiscriminate these weapons can be.
366th Assault Hel. Co.
13 AVN BN
'67, '68, '69