"2nd Amendment against tyranny."
This is a true statement
Nope. That argument is bassackwards, if you bother reading the Constitution.
"A well regulated Militia, being necessary to the security of a free State,
The militia's role, under control of the FEDERAL Government:
calling forth the Militia to execute the Laws of the Union, suppress Insurrections and repel Invasions;
To provide for organizing, arming, and disciplining, the Militia, and for governing such Part of them as may be employed in the Service of the United States,