The cartridges .223 Remington and 5.56×45mm NATO often get lumped together, but the confusion around them has a long, tangled history. Though they look nearly identical, critical differences in ...
The gunman at Sandy Hook Elementary School allegedly used a .223 caliber rifle. This is one example of a gun that uses this caliber. Update 9:50am, December 17, 2012: The New York Times reports that ...
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