This Is a .223-Caliber Rifle

The gunman at Sandy Hook Elementary School allegedly used a .223 caliber rifle. This is one example of a gun that uses this caliber.

Today a gunman at Sandy Hook Elementary School allegedly used a .223 caliber rifle to kill at least 27 people, including many children. The video below, courtesy of YouTube user KENFL74, shows a Bushmaster AR-15 shooting .223 ammunition. Many different kinds of guns use this caliber, of course; this is just one example. CNN, however, reports that a .223 Bushmaster was found on the sceneGuns and Ammo has made the case for why AR-15 guns are ideal "home defense" weapons, saying that military-style guns like the AR-15 have always been popular in the U.S. The guns are certainly popular on YouTube, where children of various ages can be seen firing them. For more information on the shooting in Newtown, Connecticut, see the Atlantic Wire's live updates

Update 9:50am, December 17, 2012: The New York Times reports that Adam Lanza used a .223 caliber AR-15 style rifle manufactured by Bushmaster to kill students and teachers at Sandy Hook Elementary School. 

Kasia Cieplak-Mayr von Baldegg is the executive producer for video at The AtlanticMore

Cieplak-Mayr von Baldegg joined The Atlantic in 2011 to launch its video channel and, in 2013, create its in-house video production department. She leads the development and production of original documentaries, interviews, and other video content for The Atlantic. Previously, she worked as a producer at Al Gore’s Current TV and as a content strategist and documentary producer in San Francisco. She studied filmmaking and digital media at Harvard University.

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