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Small arms1968–presentProfile in progress
Designated marksman rifle Sniper rifle
M21 Sniper Weapon System is a designated marksman rifle Sniper rifle originating in United States. It was built by Rock Island Arsenal Springfield Armory Smith Enterprise, Inc.. Reported operators include El Salvador, Israel, Philippines, Tunisia, United States.
Designated marksman rifle Sniper rifle
United States
1968–present
See Users
Vietnam War Laotian Civil War Cambodian Civil War 1982 Lebanon War Lebanese Civil War Salvadoran Civil War Iraq War War in Afghanistan
Marines Weapons Command Combat Development Command Limited Warfare Agency
1968
Rock Island Arsenal Springfield Armory Smith Enterprise, Inc.
M25
5.27 kg (11.6 lb)
1118 mm (44 in)
560 mm (22 in)
7.62×51mm NATO
7.62mm
Gas-operated , rotating bolt
853 m/s (2,800 ft/s)
460 m (500 yd) 900 m (980 yd) (with 3–9× scope)
3,725 m (4,074 yd)
5-, 10-, or 20-round detachable box magazine
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.
El Salvador
Israel
Philippines : Standard issue sniper rifle for regular infantry units of the Philippine Army . Being refurbished by Government Arsenal , while replacing key parts including installing new optics.
Tunisia
United States : Former primary sniper rifle of United States Army ; replaced as a sniper rifle by the M24 Sniper Weapon System in 1988 with limited usage in squad designated marksman roles persisting until being replaced by the M-14 EBR-RI and M110 beginning in 2008.
Panama : Formerly used by the defunct Panama Defense Forces
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. The M21 uses a commercially procured 3–9× variable power telescopic sight, modified for use with the sniper rifle. It is chambered for the 7.62×51mm NATO cartridge .
In standard military use, the M21 uses a 20-round box magazine as the other members of the M14 family and weighs 11 pounds (5.27 kg ) without the scope. The U.S. military never officially authorized or purchased magazines in any other capacity, although 5- and 10-round magazines are available.
M21 Sniper Weapon System United States Sniper rifle 7.62×51mm M21 unknown
Reference text from Wikipedia contributors, used under CC BY-SA 4.0.
True scale
Sourced dimensions beside a 1.75 m human reference.
Points represent sourced observations, including revisions. Revisions on the same effective date are not separate inventory events. Ranges appear in the table and are not plotted as exact points.
| Observation / report period | Value | Source | Claim state |
|---|---|---|---|
| 29 Sept 2026 | 1.118 m | Wikipedia contributors | superseded |
| 29 Sept 2026 | 1.118 m | Wikipedia contributors | superseded |
| 29 Sept 2026 | 1.118 m | Wikipedia contributors | approved |
M21 Sniper Weapon System equipment records. Variants, orders and quantities are shown as reported in each inventory source; coverage is incomplete.
El Salvador, Israel, Philippines, Tunisia, United States
Equipment reference ↗