FILE - In this July 20, 2012, file photo, a row of different AR-15 style rifles are displayed for sale at the Firing-Line indoor range and gun shop in Aurora, Colo. The right to bear arms is fundamental to the U.S., carved into the Constitution and seemingly embedded in the national DNA. But after a seemingly endless stretch of violence, Americans are confronting how far those rights extend, propelling gun issues to the forefront of this years elections. (AP Photo/Alex Brandon, File)
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