Really? You don't thing the founding fathers would have found an AR15 an "exceptional" weapon?
4,000,000 in lawful ownership, one in in every cop car in America, and they are sold at WALMART ?
Common usage.
There is probably a point you are trying to make. What is it?
and BTW, there are a bunch of semi auto assault weapons in the hands of people who are not allowed, by law to own them. What you want to do about them? Remember the felon killing firefighters in NY? With an AR15. Or the guy in Ohio with a felony and 15 semi auto rifles. Yea, you responsible gun owners are sure doing a good job of keeping those weapons out of the wrong hands.
Hey but would George Washington have found an AR15 an exceptional weapon or not?