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America's Gun: Rise of the AR-15

Monday, 8 Apr 2013 | 12:00 AM ET

The AR-15 is the most popular rifle in America, with an estimated 4 million in circulation. You can buy one at Walmart if they're not sold out. Used in a number of high-profile mass murders, the AR-15 is also the preferred rifle of homeowners, hunters and sport shooters.