With the extremely recent US Supreme Court holdings in Heller, McDonald and Caetano that it is my right under the 2nd Amendment to use those weapons for self-defense, perhaps it is time for me to get one of those 'Cold Dead Hands' bumper stickers that were popular a number of years ago.  

Or maybe I should just wait until someone invades my castle and tries to take any weapons I may own away from me.  That is the likely response by millions of US citizens who are the legal, law-abiding owners of many of those 310 million firearms.