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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 7.62x51mm NATO caliber. Up to 60% of parts of the SR-25 are interchangeable with the AR-15 and M16—everything but the receiver, the hammer, the barrel assembly and the carrier/bolt.[1] SR-25 barrels were originally manufactured by Remington Arms with its 5R (5 grooves, rounded) rifling, with twist 1:11.25 (1 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.
[edit] Design
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 minute of arc, 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 7.62x51mm NATO ammunition. The Mk 11 system includes the rifle, 20 round box magazines, QD (Quick Detachable) scope rings, Leupold Vari-X 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 a 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 aluminium 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, are guaranteed to produce groupings using factory match loads of less than 1 in (25 mm) at 100 yd (91 m) or 0.3 angular mil.
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.
[edit] Users
A U.S. Marine general fires the Mk 11.
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[edit] See also
[edit] References
- ^ a b c d Max R. Popenker. "Knights SR-25, Mk.11 Mod.0 and XM110 sniper rifle (USA)". http://world.guns.ru/sniper/sn13-e.htm. Retrieved 2010-06-27.
- ^ a b "SR-25 EM SERIES". Knight's Armament Company. http://www.knightarmco.com/sr25.html. Retrieved 2010-06-27.
- ^ Wilk (REMOV), Remigiusz. "Nowe gromy GROM". http://www.altair.com.pl/cz-art-1660.
[edit] External links
- Knight's Armament Company - SR-25 Series 7.62 mm Rifle
- Modern Firearms Site
- SR25 Comparison
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