For the Philippine Marine Corps marksman rifle of the same name, see Marine Scout Sniper Rifle.
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Designated marksman rifle
Squad Designated Marksman Rifle
Soldiers from the 3rd Infantry Division with SDM rifles.
Type
Designated marksman rifle
Place of origin
United States
Service history
In service
2004–2020
Wars
War in Afghanistan (2001–2021) Iraq War
Production history
Designer
United States Army Marksmanship Unit
Specifications
Mass
10 pounds (4.5 kg) with optic & fully loaded 30-round magazine
Length
39.5 inches (1,000 mm)
Barrel length
20 inches (510 mm)
Cartridge
5.56×45mm NATO
Action
Gas-operated (direct impingement)
Muzzle velocity
3,050 ft/s (930 m/s)
Effective firing range
600 metres (660 yd)
Feed system
20- or 30-round detachable STANAG magazine
The Squad Designated Marksman Rifle (SDM-R[1]) is an American designated marksman rifle used by the United States Army. It is essentially a heavily modified M16 rifle designed to provide U.S. Army designated marksmen greater accuracy and firepower at longer ranges, increasing an infantry squad's effective range to up to 600 meters.[2]
The SDM-R is similar in development and role to the SEAL Recon Rifle and Mk 12 Special Purpose Rifle (SPR), designed and produced for the United States Navy SEALs and the United States Special Operations Command respectively.
The SDM-R was replaced by the M110A1 SDMR, expected to enter service in the 2020s. In this role, the M110A1 retains the "Squad Designated Marksman Rifle" name.[3]
^"Soldiers in Texas Are Putting the Army's Newest Marksman Rifle Through Its Paces". 27 December 2018.
^"SAM-R步枪和SDM-R步枪" (in Chinese).
^"Heckler & Koch begins shipments of US Army Squad Designated Marksman Rifle".
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