For self-defense, some Americans chose to “carry” a handgun.

At Robb Elementary school, a shielded, armed-to-the-teeth squad of lawmen cowered in a hallway while a gunman massacred nineteen children and two teachers.

How often, on the street, in a mall, church, school, or at home, does an Urban Gunslinger unholster his or her trusty ol’ Glock and take down a Bad Guy with an AR-15?  At the same time, how many accidental shootings, murders, and suicides happen because of handguns?