Upper and lower receivers: The rifles were produced by the Army Marksmanship Unit (AMU) at Fort Benning, Georgia using either new semi-automatic ArmaLite lower receivers or existing Army M16A2 or A4 lower receivers previously supplied by either Colt or Fabrique Nationale de Herstal.
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Task Force Small Arms Readiness Group (TF SARG) conducts the week-long SDM course at the SARG academy at Camp Bullis, Texas.
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The National Guard Marksmanship Training Center of the Arkansas Army National Guard conducts the fourteen day long Squad Designated Marksman Course at Camp Joseph T. Robinson.
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