Ubiquintin.
Regarding how would the second amendment protect us from a tyrannical government ?
It would never protect citizens from a tyrannical government unless the whole country rose up against the government.
America already fought a Civil War and the southern states were not able to overthrow the government or even install their own government.
The likelihood of this happening is 0 since the whole country rising up against the government with arms would be the last straw.