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U.s. Marine Corps Designated Marksman Rifle The United States Marine Corps Designated Marksman Rifle (DMR) is a semi-automatic gas-operated rifle chambered for the 7.62x51mm NATO cartridge. It is a modified and accurized variant of the Springfield Armory M-14 battle rifle built and utilized solely by the United States Marine Corps. The most notable difference between the traditional M-14 pattern rifle and the DMR is the addition of a McMillan Tactical M2A fiberglass riflestock in OD Green color on the DMR. This particular stock features a pistol grip and a buttstock with adjustable saddle cheekpeice. The DMR also features a 22" match-grade stainless steel barrel manufactured by Kreiger Barrels, Inc., which in profile is noticeably wider than the original GI-spec barrel. It is also equipped with a simple MIL-STD-1913 rail mounting system built by Atlantic Marketing Research Systems which allows for the attachment of any optic system compatible with the MIL-STD-1913 rail (this would include a huge variety of military riflescopes and imaging devices, most notably the TS-30.xx series dayscope and the AN/PVS-10 or AN/PVS-17 night vision riflescopes). The DMR also has an operator attachable OPS, Inc. 2-port muzzle brake, threaded and collared to accept an OPS, Inc. 12th model muzzle brake suppressor sound attenuation device. Not all DMRs deployed have this OPS brake, however. Some have been seen using the traditional M-14 muzzle device and traditional front sight block. The "basic" DMR (i.e. without secondary sight, magazine, sling, basic issue items, cleaning gear, suppressor, and bipod) weighs 11 pounds or less. The DMR design allows the sight mount, barrel, bolt, and other key assemblies to be repaired/replaced at the third echelon maintenance level. The DMR is employed by the Marine Corps Scout/Sniper team when the mission requirements dictate the need for a weapon capable of delivering rapid, accurate fire against multiple targets at greater ranges and with greater lethality than the M16A2's 5.56x45mm NATO cartridge. It may also be used by the Designated Marksman (DM) assigned to the Marine Security Force Battalion and Military Police units in the execution of their security and counter-terrorist missions.
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