article 3 section 3 of the Constitution of the United States:
Treason against the United States, shall consist only in levying War against them, or in adhering to their Enemies, giving them Aid and Comfort. No Person shall be convicted of Treason unless on the Testimony of two Witnesses to the same overt Act, or on Confession in open Court. The Congress shall have Power to declare the Punishment of Treason, but no Attainder of Treason shall work Corruption of Blood, or Forfeiture except during the Life of the Person attainted.
So if anyone is thinking of using their personal firearms against the United States, that is waging war against the United State, it is TREASON. Which is why taking up arms against the United States in prior rebellions has been treason, including the U.S. Civil War when Fort Sumter was fired upon by insurgents.
There is no right to keep arms to oppose the government. There is the right to vote; use it. That is what defines us as a nation of free people.