EDITOR: Of all the mistaken notions about the Second Amendment, the most grievous is the idea that the founders wanted an armed public to overthrow a government they felt had become tyrannical. What government signs into law its own potential death warrant? And who gets to decide when a government has become tyrannical? Is it those on the left who believe the government is fascist, or those on the right who think it is communist, or maybe those who find it too religious or not religious enough?
Read the Constitution. Article I says the government is "to provide for calling forth the militia to execute the Laws of the Union, suppress insurrections and repel invasions" and "to provide for organizing, arming and disciplining the militia." To try to overthrow the government is an insurrection and would make you guilty of treason.
The Second Amendment does nothing to change this. Your right to bear arms is in service to a militia that is under government control. If you think the government is tyrannical and you want to overthrow it, start writing your own Constitution, because you have no support from this one.