Inside the rise of AR-15-style rifles in America

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There are 20 million and counting AR-15-style rifles legally in the U.S, but what does research reveal about the prevalence of assault weapons in violent events? TC’s Louis Klarevas, who specializes in gun violence and safety, discusses – via ABC News.

The use of assault weapons is on the rise. In the last three years, 67% of gun massacres were with assault weapons.