America’s standing army in 1787 wasn’t exactly intimidating. By contrast, America’s standing army in 2015 is, and I’m sure Ted Cruz would agree, not to be messed with. An AR-15 doesn’t hold a candle to your local police force; starting beef with the full firepower of the American military with nothing more sophisticated than a semi-auto is like bringing a ham sandwich to a gun fight. If citizens really did rise up and revolt with the guns currently available, they would lose and lose badly.
Try it and watch what happens. The only thing is, don't expect to be able to hide and watch and merely cheer on the forces of government repression as a spectator at the next American civil war, Mr. Green. 4GW civil war is a bitch, especially for those who advocate it and who lay the intellectual groundwork for government murder of the citizenry.