SR-25

Stoner Rifle-25
IDF SR-25 with sound suppressor attached
Type	Sniper rifle
Land of Origin	United States
Specifications
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)
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)
Cartridge	7.62x51mm NATO
Action	Gas-operated, rotating bolt
Rifling/Twist	1:11.25"
Rate of Fire	Semi-automatic
Muzzle velocity	Rifle: 2,560 fps (780 m/s) with 175 gr. M118LR Carbine: 2,517 fps (767 m/s) with 175 gr. M118LR
Feed	10 and 20-round detachable box magazine
Sights	None provided, integral Weaver-style rail provided for scope mount.
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
Unit Cost	US$2495
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
Can expect .75 MOA performance. Trigger is modified AR-15, fully adjustable for over-travel and sear engagement.

The SR-25 (Stoner Rifle-25) is a semi-automatic sniper rifle designed by Eugene Stoner and manufactured by Knight's Armament Company. 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. 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 in. / 286mm). The heavy20 in (510 mm) barrel is free-floating, so handguards are attached to the front of the receiver and do not touch the barrel.

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). 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. 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 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, 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, though the M110 utilizes the newer URX Rail system, a length-adjustable fixed buttstock, and an integrated flash suppressor.

Comparison to the AR-10

Main article: AR-10 vs SR-25 Comparison

Similarities to and differences from Stoner's AR-10 design are discussed on the AR-10 vs SR-25 Comparison page (taken from "Technical Note 6: Technical Information Concerning AR-10B Series Rifles," from the ArmaLite website).

The information on the page is taken from a paper ArmaLite originally published in order to answer repeated questions concerning the ArmaLite AR-10B series rifles, particularly on differences between the AR-10B series, the M-16 series service rifle, and the SR-25 rifle produced by Knight's Armament Company (KAC).

Variants

Variant	Features
SR-25 Match Rifle	24" free floating barrel Original SR-25 as issued to US Military snipers Semiautomatic and gas operated 1 MOA GUARANTEE Unloaded weight: 10 3/4 lbs
SR-25K Special Edition	Special Edition Carbine (1 of 100) 16" free floating barrel with flash hider Collapsible carbine stock Unloaded weight: 7 3/4 lbs
SR-25 LIGHTWEIGHT MATCH	20" medium contour free floating barrel Specially addresses requests from many action rifle competitors for a lighter weight precision rifle Unloaded weight: 9 1/2 lbs
SR-25 STONER CARBINE	16 " free floating barrel Specially shortened non-slip handguard Unloaded weight: 7 3/4 lbs.
SR-25 SPORTER RIFLE	20" lightweight contour barrel Adjustable front post and flip rear peep sight Removable carrying handle to allow for scope mounting M16A2 type handguards Unloaded weight: 8 3/4 lbs.
David Tubb SR-25 Match Rifle	Specially hand tuned rifle, built to the same specifications as the rifle David used to win his championships in recent years. Caliber: 6.5-08 (260 Remington) Sights: Adjustable for cant front and rear Handguard: Can be rotated for proper fit.

No, not that one...

In addition to the rifles listed in the table above, there are several other "one-off" variants that Knight has produced for various markets. These have included specially compensated IPSC models as produced for Benny Hill, who used his rifle to win IPSC three gun championships, as well as special production units for the military.

Users

• Australia: Australian Army.
• Israel: IDF special forces.
• Poland: GROM.
• Thailand: Royal Thai Army.
• United States: United States Military.

Resources

Gun Owners' Resource has the following relevant documents available for free download for the SR-25 and/or its variants:

• Stoner SR-25 Military Operator's Manual - - Stoner SR-25 7.62mm Mark II Mod 0 Type Rifle Systems (KAC Port Number: 98169 NSN: 1005-01-475-7980) and other Military Light Weight Match Models

This article or section is missing resources, such as diagrams or manual links, and could use more input to fill in the missing bits. You (yes, you!) can help Gunsopedia provide more comprehensive information to our users by using your own knowledge to add to it.

See also

• United States Navy Mark 12 Mod X Special Purpose Rifle
• AR-10 vs SR-25 Comparison

External links

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