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AR-15 pistol vs rifle: Colorado suspect allegedly used a Ruger AR-556 pistol. Here's how it differs from an AR-15-style rifle | CNN
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With AR-15s, Mass Shooters Attack With the Rifle Firepower Typically Used by Infantry Troops - The New York Times
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With AR-15s, Mass Shooters Attack With the Rifle Firepower Typically Used by Infantry Troops - The New York Times
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