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redredred Federalist #29 lays out the founding fathers' views on citizens militias. The idea that anyone can own any gun for any reason is a very modern one, based on decades of NRA propaganda aimed at nothing more lofty than selling more guns. The Heller decision dispensed with the "well-regulated militia" portion of the second amendment, as if the framers had put that in there for no reason.
The American Revolution didn't overthrow the British Crown, it separated the colonies from it. A civil war with the goal of replacing the current US government with a different one would require more than just a bunch of yahoos with AR-15s. You'd need training, a chain of command, logistics, and supply lines - things the US military is very good at, but don't exist in the private arena to any extent.
The first season of Robert Evans' podcast "It Could Happen Here" imagines how widespread rioting leads to the federal government withdrawing from large parts of the country, followed by their being taken over by local warlords. It would be Syria on steroids, not some national libertarian paradise.