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The .223 Remington (designated 223 Remington by SAAMI and 223 Rem. by the C.I.P.) is a rimless, bottlenecked, centerfire rifle cartridge. It was developed in 1957 by Remington Arms and Fairchild Industries for the U.S. Continental Army Command of the United States Army as part of a project to create a small-caliber, high-velocity firearm. The .223 Remington is considered one of the most popular common-use cartridges and is currently used by a wide range of semi-automatic and manual-action rifles.

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