<P> Lake City Army Ammunition Plant (LCAAP) is a 3,935 - acre (15.92 km) U.S. government - owned, contractor - operated facility in northeastern Independence, Missouri, that was established by Remington Arms in 1941 to manufacture and test small caliber ammunition for the U.S. Army . The facility has remained in continuous operation except for one 5 - year period following World War II . As of July 2007, the plant produced nearly 1.4 billion rounds of ammunition per year . In addition, Lake City performs small caliber ammunition stockpile reliability testing and has ammunition and weapon testing responsibilities as the NATO National and Regional Test Center . </P> <P> Remington Arms operated the plant from its inception until 1985, when operations were taken over by Olin Corporation . Since April 2001, it has been operated by Alliant Techsystems (ATK) (renamed Orbital ATK after a merger in 2015). LCAAP is the single largest producer of small arms ammunition for the United States Armed Forces . </P>

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