The second amendment protects our rights to own "Guns". There is no definition of "Gun" in the constitution.

So, in case I or my family is attacked by more than 9 bad guys I want to own an automatic (sub machine gun used for close quarters combat) to protect us. A revolver or semi automatic doesn't fire fast enough to provide enough protection. Now, I recognize that automatics throw a lot of lead so I'd probably be better of just tossing a hand grenade. Besides, I like to collect submachine guns and hand grenades.

Again, the constitution doesn't define a "Gun" so isn't any restriction on guns unconstitutional?

Before any writes me off as a nut I'm being facetious. There is no place in civilized society for weapons that are designed primarily to kill people. How can we accept the 10,000 firearms deaths which occur each year in this country?

I am advocating full backround checks and the banning of semiautomatic weapons NOT the registration of guns.

Last point - when the second amendment was written the most powerful personal weapons were the musket and single shot pistol.