Joshua Keating gathers evidence that widespread gun ownership doesn't translate into successful uprisings against oppressive government:

[T]he country ranked last on the [Small Arms Survey] — with only 0.1 guns per 100 people — is Tunisia, which as you'll recall was still able to overthrow a longtime dictator in 2011. With only 3.5 guns per 100 people, the Egyptian population that overthrew Hosni Mubarak was hardly well armed either. On the other hand, Bahrain, where a popular revolution failed to unseat the country's monarchy, has 24.8 guns per 100 people, putting it in the top 20 worldwide. A relatively high rate of 10.7 guns per 100 people in Venezuela hasn't stopped the deterioration of democracy under Hugo Chávez.

Michael Moynihan recently dismantled the myth pushed by gun activists that Hitler's rise was aided by gun control laws.