All-American Killer: How the AR-15 Became Mass Shooters' Weapon of Choice

The AR-15 assault rifle was engineered to create what one of its designers called "maximum wound effect." Its tiny bullets – needle-nosed and weighing less than four grams – travel nearly three times the speed of sound. As the bullet strikes the body, the payload of kinetic energy rips open a cavity inside the flesh – essentially inert space – which collapses back on itself, destroying

This article originally appeared on www.rollingstone.com: All-American Killer: How the AR-15 Became Mass Shooters' Weapon of Choice

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