An M4 Colt rifle is displayed at the Colt Defense Plant in Hartford, Conn., Thursday, March 27, 2008. No weapon is more important to tens of thousands of U.S. troops in Iraq and Afghanistan than the carbine rifle. And for well over a decade, the military has relied on one company, Colt Defense of Hartford, Conn., to make the M4s they trust with their lives. (AP Photo/Richard Lardner)

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