The Bushmaster semi-automatic assault rifle used in Friday's attack on an elementary school in Newtown, Conn., is a style of weapon used often in mass shootings. Melissa Block speaks with Malcolm Brady, retired assistant director of what was then known as the Bureau of Alcohol, Tobacco and Firearms, about the style of weapon and why it's so often linked to these tragedies.
One Gun Used In Conn. Attack Has 'Rambo Effect'
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