On November 30 last year, 22-year-old Jared Lee Loughner walked into a Sportsman's Warehouse store in Tucson, Arizona, and bought a Glock 19 semi-automatic handgun, serial number PWL699. He passed the instant background check required by US federal law. Under the lax state gun laws, he was then allowed to conceal and carry his pistol without a permit. On Sunday, Loughner was charged with using the gun in a rampage in a parking lot outside a Tucson supermarket that left... (GunPolicy.org)