The 2nd amendment under its original interpretation gives you the right to own and carry firearms at all times.
"No free man shall ever be debarred the use of arms. The strongest reason for the people to retain the right to keep and bear arms is, as a last resort, to protect themselves against tyranny in government" -- Thomas Jefferson, 1 Thomas Jefferson Papers, 334
"The constitutions of most of our States assert that all power is inherent in the people; that... it is their right and duty to be at all times armed." --Thomas Jefferson to John Cartwright, 1824. ME 16:45
"The best we can hope for concerning the people at large is that they be properly armed." -- Alexander Hamilton, The Federalist Papers at 184-188
"One of the ordinary modes, by which tyrants accomplish their purposes without resistance, is, by disarming the people, and making it an offense to keep arms."-- Constitutional scholar Joseph Story, 1840
As to the species of exercise, I advise the gun. While this gives [only] moderate exercise to the body, it gives boldness, enterprise, and independence to the mind. Games played with the ball and others of that nature, are too violent for the body and stamp no character on the mind. Let your gun, therefore, be the constant companion to your walks." -- Thomas Jefferson to Peter Carr, 1785. ME 5:85, Papers 8:407, writing to his teenaged nephew.
Also note: Thomas Jefferson was the only president to walk to his government offices, and spend the entire day with his sidearm visibly displayed.