Probably all started back when they banned cannons.
"So if the intent of the 2nd amendment was to keep government at bay through the threat of force and a bloody revolution every 200 years, how is that possible today?"
Do you really think the American military will ever agree to take on 80 million American firearm owners? Who would they bomb with their sophisticated weapons of mass destruction? Their own liberal infested cities? That'll create a lot of friends.
As long as there are firearms widely distributed amongst the population, the threat of force of a bloody revolution can exist. As long as that threat exists, the government is still basically responsible to answer to the people.
This is why there is such a strong apprehension to gun banning of any kind. It reduces the potential threat.
Also you have to ask yourself
In 1968 the Kongrss banned "destructive devices" including anything over .5 cal However, they didn't keep the police from arming up
You can still own cannons. Some owners get together and have cannon shoots.
I think that "Right" came into question back in 61 when a bunch of Democrats down in South Carolina thought it would be a good idea to fire on Fort Sumpter.