460 m (500 yd) 900 m (980 yd) (with 3–9× scope)[3][4]
Maximum firing range
3,725 m (4,074 yd)
Feed system
5-, 10-, or 20-round detachable box magazine
Sights
Front: National Match front blade. Rear: Match-grade hooded aperture with one-half minute adjustments for both windage and elevation 26+3⁄4 in sight radius.
The M21 Sniper Weapon System (SWS) in the US Army is a national match grade M14 rifle, selected for accuracy, and renamed the M21 rifle.[5] The M21 uses a commercially procured 3–9× variable power telescopic sight, modified for use with the sniper rifle.[6] It is chambered for the 7.62×51mm NATO cartridge.
^"浴火重生——对越自卫反击战对我国轻武器发展的影响". September 23, 2014. Retrieved August 5, 2022.
^Katz, Sam; Russell, Lee E. (July 25, 1985). Armies in Lebanon 1982–84. Men-at-Arms 165. Osprey Publishing. p. 9. ISBN 9780850456028.
^FM 23-8, April 1974, p. 7
^TC 23-14, October 1969, p. 17
^FM 23-8, M14 and M14A1 Rifles and Rifle Marksmanship. Headquarters, Department of the Army, April 1974, p. 178
^TC 23-14, Sniper Training and Employment, Headquarters, Department of the Army, Oct 1969, p. 17
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