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.223/5.56x45mm

The development of the cartridge, which eventually became the .223 Remington, was intrinsically linked to the development of a new lightweight combat rifle. The cartridge and rifle were developed by Fairchild Industries, Remington Arms, and several engineers working toward a goal developed by U.S. Continental Army Command (CONARC). 223 is considered to be the most common rifle cartridge in the United States.