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SR-25
File:Mk11mod0.jpg Mk 11 Mod 0
Type	Sniper rifle
Place of origin	United States
Service history
In service	1990-present
Used by	See Users
Wars	Afghanistan War, Iraq War, 2006 East Timorese crisis, 2nd Intifada
Production history
Designer	Eugene Stoner
Manufacturer	Knight's Armament Company
Variants	SR-25 Enhanced Match rifle, with 20 in (510 mm) barrel SR-25 Enhanced Match Carbine, with 16 in (410 mm) barrel and M110 flash suppressor
Specifications
Weight	Match Rifle 10.75 lb (4.88 kg), LwMatch 9.5 lb (4.3 kg), Carbine 7.5 lb (3.4 kg), Sporter 8.75 lb (3.97 kg)
Length	1,118 mm (44.0 in)
Barrel length	Match Rifle 24 in (610 mm) (also LwMatch & Sporter 20 in/510 mm, Carbine 16 in/410 mm)
Cartridge	7.62×51mm NATO
Action	Gas-operated, rotating bolt
Rate of fire	Semi-automatic
Feed system	10 and 20-round detachable box magazine

The SR-25 (Stoner Rifle-25)^[1] is a semi-automatic sniper rifle designed by Eugene Stoner and manufactured by Knight's Armament Company.^[1] The SR-25 uses a rotating bolt and a direct impingement gas system. It is loosely based on Stoner's AR-10, rebuilt in its original 7.62×51mm NATO caliber. Up to 60% of parts of the SR-25 are interchangeable with the AR-15 and M16—everything but the upper and lower receivers, the hammer, the barrel assembly and the bolt carrier group.^[1] SR-25 barrels were originally manufactured by Remington Arms with its 5R (5 grooves, rounded) rifling, with twist 1:11.25 (1 complete turn in 11.25 inches / 286 millimetres). The heavy 20 in (510 mm) barrel is free-floating, so handguards are attached to the front of the receiver and do not touch the barrel. First military purchase was spearheaded by the US Navy in the early 1990s; the first operational deployment and use of the SR-25 sniper rifle was with US Navy SEAL snipers supporting operations in Somalia 1993.

Design[link]

The SR-25 enhanced match rifle utilizes the newer URX II Picatinny-Weaver rail system, rather than the older Mk 11 free-floating RAS, on the top of the receiver to accept different scope mounts or a carrying handle with iron sights (front sight mounted on the rail located on the forward end of the non-modular handguard).^[2] The match version is designed to shoot at a precision of 0.5 minutes of angle, which corresponds to 0.5-inch (13 mm) groups at 100 yards (91 m).

The Mk 11 Mod 0 system comes in 7.62 mm NATO caliber, and is designed for match-grade 7.62×51mm NATO ammunition. The Mk 11 system includes the rifle, 20 round box magazines, QD (Quick Detachable) scope rings, Leupold Mark 4 Mil-dot riflescope, Harris swivel-base bipod on a Knight's mount, and QD sound suppressor, which is also manufactured by Knight's Armament Co.^[1] Flip-up BUIS (Back up iron sights) are attached to the modified gas block and upper receiver.

The Mk 11 Mod 0 utilizes an Obermeyer 20 in (510 mm) match target barrel, along with a RAS (Rail Accessory System) fore-end made by KAC, consisting of an 11.35 in (288 mm) long match fore-end. The RAS allows for quick attachment/detachment of MIL-STD-1913 components. The aluminum fore-end makes no contact with the barrel forward of the receiver, allowing for extreme accuracy. The Mk 11 Mod 0 has an empty weight of 15.3 lb (6.9 kg), and an overall length of 45.4 in (115 cm). The civilian version, using the longer 24 in (610 mm) match barrel, is guaranteed to produce groupings of less than 1 in (25 mm) at 100 yd (91 m), or 0.3 angular mil, using factory match loads.

The new SR-25 Enhanced Match (E.M.) Carbine is very similar to the KAC M110 Semi-Automatic Sniper System,^[2] though the M110 utilizes the newer URX Rail system, a length-adjustable fixed buttstock, and an integrated flash suppressor. Starting late 2011, USMC snipers will replace Mk11 Mod 0 rifles with the M110 Semi-Automatic Sniper System on a one-for-one basis.

Gallery[link]

• 

  Israeli Defense Forces SR-25 with sound suppressor attached.

• 

  A U.S. Marine general fires the Mk 11.

• 

  Marksmen from the U.S. Coast Guard Maritime Security Response Team with Mk 11s

Users[link]

•  Australia: Australian Army^[3] and Police Tactical Groups.^[4][5]
•  Greece: EKAM special police unit.^[6]
•  Hong Kong: Special Duties Unit.^{[citation needed]}
•  Israel: IDF special forces.^[7]
•  Philippines: Special Action Force^[8]
•  Poland: GROM.^[9]
•  Thailand: Royal Thai Army.^[10]
•  United States: United States Military.^[11]

See also[link]

• United States Navy Mark 12 Mod X Special Purpose Rifle
• List of individual weapons of the U.S. Armed Forces

References[link]

External links[link]

Wikimedia Commons has media related to: Knight SR-25

• Knight's Armament Company - SR-25 Series 7.62 mm Rifle
• Modern Firearms Site
• SR25 Comparison