Army Sgt. James Snow has carried an M-4 carbine and an M-110 sniper rifle as an infantryman on missions. With the M-4, he knew he was capable of hitting a target accurately up to only 300 meters. With a sniper rifle, he had less maneuverability and spent a lot of time breaking down and reassembling the larger weapon to carry.< Last month, Snow was given the opportunity to try out the Army's new Squad Designated Marksman Rifle, or SDM-R. After just a couple days handling the new weapon, he said it felt like something that could fill the needs of...