Military Factory
flag of United States

Stoner SR-25 (Stoner Rifle-25) Designated Marksman Rifle / Sniper Rifle (1990)

Authored By Staff Writer | Last Updated: 6/22/2014

Designed by Eugene Stoner, the SR-25 sniper rifle has seen recent actions in East Timor, Afghanistan and Iraq.

Tweet
The SR-25 Enhanced Match rifle (EM) was a semi-automatic sharpshooter / sniper rifle system developed within the United States during the late 1980s. Production ensued in 1990 to which the weapon was formally adopted for service in the US military followed by other allied nations. While currently seeing frontline service, the SR-25 is steadily being replaced in some circles by newer more modern types now entering service. To date, the SR-25 has seen extensive combat actions in and around Afghanistan, Iraq, East Timor and the Gaza Strip. Key global operators of the weapon type (beyond the US) include Australia, Greece, Israel, Poland and Thailand.

The stellar M21 sniper rifle of 1969 proved during the Vietnam War the value of long-range firepower time and again. It was a semi-automatic system utilizing the 7.62x51mm NATO cartridge from a 5-, 10- or 20-rond detachable box magazine reaching out to ranges in excess of 900 yards. The M21 was, in essence, an evolution of the M14 semi-automatic service rifle which, itself, was a development of the war-winning World War 2-era M1 Garand self-loading rifle. The M21 was progressively updated to the M25 system which saw combat service in the Gulf War of 1991.

By the 1990s, attention was given to developing a similar system for the modern military. To keep development and production costs at a minimum, the Armalite AR-10 (chambered for the 7.62x51mm NATO) was selected for modification. The AR-10 entered service in 1955 but only saw limited service, production ceasing a short time later in 1966 with some 10,000 units completed. Eugene Stoner - designer of the AR line as well as the M16 - took the helm in the new rifle's development. The identifiable carrying handle so prevalent in the AR and M-16 series of automatic weapons was removed and an accessories rail system was fitted instead. This would allow for the installation of various specialized optics and the like. Additional rails were adapted to the top and bottom of the forend and silencer could be affixed to the barrel muzzle. The barrel was "free-floating" in the design to allow for maximum precision at range and an optional folding bipod could be affixed. The resulting design became known as the "SR-25" ("Stoner Rifle-25") with arrangement to be handled by the Knight's Armament Company.

Overall, the SR-25 retained much of the form and function of the original AR pattern including up to 60% commonality of parts with the AR-15 and M-16 - which made it an excellent economical investment. It was chambered to fire the rifle-caliber 7.62x51mm NATO cartridge from a 10- or 20-round detachable box magazine through a semi-automatic action (one cartridge fired for each trigger pull). The firing action centered around the conventional gas-operated, rotating bolt system consistent with the original AR it was derived from. The rifle sported an overall length of 46.25 inches with a 20 inch barrel assembly. Overall unloaded weight was 9.75lbs.

The SR-25's primary marketed form today is the "Mk 11 Mod 0". There is also an "SR-25 Enhanced Match (EM) Carbine form" which is shorter in length.

Text ©2003-2015 www.MilitaryFactory.com. All Rights Reserved. No Reproduction Permitted. Email corrections/comments to MilitaryFactory at Gmail dot com. Material presented throughout this website is for historical and entertainment value and should not to be construed as usable for hardware restoration, maintenance or general operation. Consult manufacturers directly for such information.

Specifications for the
Stoner SR-25 (Stoner Rifle-25)
Designated Marksman Rifle / Sniper Rifle


Country of Origin: United States
Manufacturer: Knights Armament Company - USA
Initial Year of Service: 1990


Overall Length: 1118 mm (44.02 in)
Barrel Length: 610.00 mm (24.02 in)
Weight (Empty): 10.76 lb (4.88 kg)


Caliber*: 7.62x51mm NATO
Action: Gas-Operated; Rotating Bolt; Semi-Automatic
Feed: 10- or 20-round detachable box magazine
Sights: Optional Optics


* Listed caliber(s) for firearms may be model dependent if more than one model type/chambering was produced. Always consult official manufacturer's information or a licensed dealer.


Variants:
SR-25 - Base Series Designation


SR-25 "Enhanced Match Rifle" - Fitted with 510mm (20-inch) barrel.

SR-25 "Enhanced Match Carbine" - Fitted with 410mm (16-inch) barrel; M110 SASS-stype flash suppressor.


Operators:
Australia; Greece; Israel; Poland; Thailand; United States