The U.S. Army 3rd Infantry Division saw limited use of a modified M16 which was accurized in a manner similar to the SAM-R, unofficially designated the AMU Squad Designated Marksman Rifle (SDM-R) This rifle was designed for engagements up to 1000m.
3-я пехотная дивизия ограниченно использовала модифицированную М16, которая сделана в той же манере, что и SAM-R, неофициально прозванной Squad Designated Marksman Rifle (SDM-R).