View source for SR-25

{{For|State Route 25 or State Road 25|list of highways numbered 25}}
{{Infobox weapon
| name               = SR-25
| image              = [[File:SR-25 pic02.jpg|border|300px]]
| caption            = An SR-25 outfitted with a riflescope, bipod and a detachable suppressor
| origin             = United States
| type               = [[Designated marksman rifle]]<br>[[Semi-automatic rifle|Semi-automatic]] [[sniper rifle]]
| is_ranged          = yes
<!-- Service history -->| service            = 1990–present
| used_by            = See ''[[SR-25#Users|Users]]''
| wars               = {{Plain list|
* [[Second Intifada]]
* [[War in Afghanistan (2001–2021)]]
* [[Operation Enduring Freedom - Philippines]]
* [[Iraq War]]
* [[2006 East Timorese crisis]]
* [[Zamboanga City crisis]]
* [[Battle of Marawi]]
}}
<!-- Production history -->| designer           = [[Eugene Stoner]]
| design_date        = 
| manufacturer       = [[Knight's Armament Company]]
| production_date    = 
| number             = 
| variants           = * SR-25 Enhanced Match rifle, with {{convert|20|in|mm|abbr=on|adj=on}} barrel

* SR-25 Enhanced Match Carbine, with {{convert|16|in|mm|abbr=on|adj=on}} barrel and [[M110 Semi-Automatic Sniper System|M110]] [[flash suppressor]]
* MK 11 MOD 0
* MK 11 MOD 1
* MK 11 MOD 2

<!-- General specifications -->| weight             = Match Rifle {{convert|10.75|lb|kg|abbr=on}},<br> LwMatch {{convert|9.5|lb|kg|abbr=on}},<br> Carbine {{convert|7.5|lb|kg|abbr=on}},<br> Sporter {{convert|8.75|lb|kg|abbr=on}}
| length             = {{convert|1118|mm|in|abbr=on|adj=on}}
| part_length        = Match Rifle {{convert|24|in|mm|abbr=on|adj=on}} 
(also LwMatch & Sporter {{convert|20|in|mm|abbr=on|disp=or}}, Carbine {{convert|16|in|mm|abbr=on|disp=or}})
| crew               = <!-- Ranged weapon specifications -->
| cartridge          = [[7.62×51mm NATO]]
| caliber            = 
| action             = [[Gas-operated]], [[Closed bolt|closed]] [[rotating bolt]], [[Direct impingement#Stoner bolt and carrier piston system|Stoner bolt and carrier piston]]
| rate               = [[Semi-automatic rifle|Semi-automatic]]
| velocity           = 
| range              = 
| max_range          = 
| feed               = 10- and 20-round detachable [[SR-25 pattern magazine|SR-25 pattern]] box magazine
| sights             = 
}}
 
The '''SR-25''' (Stoner Rifle-25)<ref name="WG">{{cite web |author=Max R. Popenker |title=Knights SR-25, Mk.11 Mod.0 and XM110 sniper rifle (USA) |url=http://world.guns.ru/sniper/sn13-e.htm |url-status=live |archive-url=https://web.archive.org/web/20100629122151/http://world.guns.ru/sniper/sn13-e.htm |archive-date=2010-06-29 |access-date=2010-06-27}}</ref> is a [[designated marksman rifle]] and [[Semi-automatic firearm|semi-automatic]] [[sniper rifle]] designed by [[Eugene Stoner]] and manufactured by [[Knight's Armament Company]].<ref name="WG"/>

The SR-25 uses a [[rotating bolt]] and a [[Direct impingement#Stoner bolt and carrier piston system|Stoner bolt and carrier piston]] 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 rifle|M16]]—everything but the upper and lower [[Receiver (firearms)|receivers]], the [[Hammer (firearm)|hammer]], the [[Gun barrel|barrel]] assembly and the [[Bolt (firearm)|bolt]] carrier group.<ref name="WG"/> SR-25 barrels were originally manufactured by [[Remington Arms]] with its 5R (five grooves, right twist) [[rifling]], with twist 1:11.25. The heavy {{convert|24|in|mm|adj=on}} barrel is [[Free-floating barrel|free-floating]], so handguards are attached to the front of the receiver and do not touch the barrel.

==History==
In the late 1950s, [[Eugene Stoner]] designed the [[AR-10]] battle rifle to equip U.S. troops. It was accurate for an auto-loading rifle, but it lost the competition to the [[M14 rifle]]. The patent rights for the AR-10 and the [[AR-15]] were sold to [[Colt's Manufacturing Company]]. Colt focused on the AR-15, giving others the ability to capitalize on the AR-10 system.<ref name="sadj">[http://sadefensejournal.com/wp/?p=741 Knight’s Armament M110: The New Breed of Sniper Rifle] - SAdefensejournal.com, 5 January 2012</ref>

In the early 1990s, Stoner joined [[Knight's Armament Company]]. He continued his AR-10 design work. The result was the SR-25 (adding together the numbers of the AR-10 and AR-15) which improved the AR-10 design with [[M16 rifle|M16A2]] advancements and parts commonality. The original SR-25 was released in the early 1990s and had a heavy free-floating {{convert|24|in|mm|abbr=on}} match grade barrel with a [[fiberglass]] handguard. It had a flat top upper receiver with a [[Picatinny rail|Mil-Std 1913 rail]] for mounting optics and a 2-stage match grade trigger. The bolt carrier was similar to the AR-10's, being [[Chrome plating|chrome plated]] and having a captive firing pin retainer pin. The SR-25 was designed specifically to fire {{convert|168|gr|g|abbr=on}} open-tip match cartridges. Accuracy was guaranteed at or under 1 [[minute of angle]]. At first, AR-10 type 20-round magazines were used, but they were later replaced by steel 20-round magazines resembling those used by the M16.<ref name="sadj"/>

[[United States Special Operations Command]] took interest in the SR-25, particularly its high magazine capacity and faster engagement time compared to bolt-action rifles. After some modifications, SOCOM adopted the SR-25 as the '''Mk 11 MOD 0''' in May 2000. Changes included a shorter {{convert|20|in|mm|abbr=on}} barrel that could fire M118 and M118LR 7.62×51mm NATO rounds and had a quick detachable sound suppressor mount. An {{convert|11.35|in|mm|abbr=on}} free-floating handguard rail system allowed mounting accessories. Flip-up front sights and adjustable back-up iron sights were added, and an M16A2 stock and pistol grip were used.<ref name="sadj"/>

Beginning in mid-2011, SOCOM began divesting the Mk 11 MOD 0 from their inventory and replacing it with the [[FN SCAR|SSR Mk 20]], the sniper variant of the FN SCAR. The Mk 11 was completely replaced by 2017.<ref>[http://kitup.military.com/2011/06/usasoc-reveals-fnh-usa-mk20-plan.html USASOC Reveals FNH-USA Mk20 Plan] - Kitup.Military.com, 8 June 2011</ref>

==Design==
The SR-25 enhanced match rifle utilizes the newer URX II [[Picatinny rail|Picatinny]]-[[Weaver rail mount|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).<ref name="Site">{{cite web|url=http://www.knightarmco.com/commercial/?term=sr-25|title=SR-25 EM SERIES|accessdate=2010-06-27|publisher=Knight's Armament Company|archive-date=2012-10-22|archive-url=https://web.archive.org/web/20121022001853/http://www.knightarmco.com/commercial/?term=sr-25|url-status=dead}}</ref> The match version is designed to shoot at a precision of 0.5 [[minutes of angle]], which corresponds to {{convert|0.5|in|mm|adj=on}} [[shot grouping|groups]] at {{convert|100|yd|m}}.

The '''Mk 11 MOD 0''' system is chambered for 7.62×51mm NATO, and is designed for [[match-grade]] ammunition. The Mk 11 system includes the rifle, 20 round box magazines, QD (Quick Detachable) scope rings, [[Leupold]] Mark 4 [[Telescopic sight#Milling reticles|Mil-dot riflescope]], Harris swivel-base bipod on a Knight's mount, and QD [[Suppressor|sound suppressor]], which is also manufactured by Knight's Armament Co.<ref name="WG"/> 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 {{convert|20|in|mm|abbr=on|adj=on}} match target barrel, along with a RAS (Rail Accessory System) fore-end made by KAC, consisting of an {{convert|11.35|in|mm|abbr=on|adj=on}} 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 improved accuracy. The Mk 11 MOD 0 has an empty weight of {{convert|15.3|lb|kg|abbr=on}}, and an overall length of {{convert|45.4|in|cm|abbr=on|adj=on}}. The civilian version, using the longer {{convert|24|in|mm|abbr=on|adj=on}} match barrel, is guaranteed to produce groupings of less than {{convert|1|in|mm|abbr=on}} at {{convert|100|yd|m|abbr=on}}, or 0.3 [[angular mil]], using factory match loads.

During the [[Iraq War]], the [[United States Marine Corps]] ordered 180 '''Mk 11 MOD 1''' rifles which were Mk 11s equipped with the upper receiver of the [[M110 Semi-Automatic Sniper System]]. The M110 upper gave the Mk 11 MOD 1 a URX modular rail system and a flash suppressor on the barrel. These saw limited use before they were phased out when the Marines chose to purchase the '''Mk 11 MOD 2''', which was simply the [[United States Special Operations Command|USSOCOM]] and [[United States Navy|U.S. Navy]] designation for the complete M110 rifle.<ref>{{Cite web|last=Johnson|first=Steve|date=2009-09-29|title=Knight's Armament Civilian Mk11 Mod 1 SR-25|url=https://www.thefirearmblog.com/blog/2009/09/29/knights-armament-civilian-mk11-mod-1-sr-25/|access-date=2021-04-20|website=The Firearm Blog|language=en-US}}</ref>

The SR-25 Enhanced Match (E.M.) Carbine is very similar to the M110 Semi-Automatic Sniper System,<ref name="Site"/> though the M110 utilizes the newer URX Rail system, a length-adjustable fixed buttstock, and an integrated flash suppressor. Starting in late 2011, USMC snipers began to replace Mk 11 MOD 0 rifles with the M110 on a one-for-one basis.

==Users==
<!--READ FIRST: This section is for cited entries only. Please do not add entries into this list without a citation from a reliable source. All entries without a citation will be removed. Thank you.-->

*{{flag|Australia}}: [[Australian Army]],<ref>{{cite web|title=Sniper|url=http://www.army.gov.au/stayarmy/Sniper.asp|url-status=live|website=The Australian Army|publisher=Library of Congress Web Archives Collection|accessdate=2010-08-13|archiveurl=http://webarchive.loc.gov/all/20090622153621/http://www.army.gov.au/stayarmy/Sniper.asp|archivedate=2009-06-22}}</ref> [[Royal Australian Air Force]] [[Airfield Defence Guards]]<ref>{{cite web|url=http://www.defencejobs.gov.au/airforce/jobs/AirfieldDefenceGuard/|title=Defence Jobs: Airfield Defence Guard - Further Training|publisher=Department of Defence|accessdate=19 April 2016|archive-date=23 July 2008|archive-url=https://web.archive.org/web/20080723023828/http://www.defencejobs.gov.au/airforce/Jobs/AirfieldDefenceGuard/|url-status=dead}}</ref> and [[Police Tactical Group]]s.<ref>{{cite web|title=AFP buys new weapon for International Deployment G36C|url=http://www.responseaustralia.net/issues/Issue08.pdf|url-status=live|website=Response Australia|page=23|accessdate=2011-09-05|archiveurl=https://web.archive.org/web/20110929141505/http://www.responseaustralia.net/issues/Issue08.pdf|archivedate=2011-09-29}}</ref><ref>{{cite web |url=http://www.dailytelegraph.com.au/news/gallery/gallery-e6frewxi-1226219551228?page=3 |title=naden {{!}} Fugitive Malcolm Naden {{!}} thetelegraph.com.au |website=www.dailytelegraph.com.au |url-status=dead |archive-url=https://web.archive.org/web/20120902220312/http://www.dailytelegraph.com.au/news/gallery/gallery-e6frewxi-1226219551228?page=3 |archive-date=2012-09-02}}</ref>
*{{flag|Bangladesh}}: [[Special Warfare Diving and Salvage]] (SWADS) of [[Bangladesh Navy]].<ref>{{Cite web |title= |url=http://dhaka.usembassy.gov/uploads/images/hSceCcaxqZek1JcQr1LWmQ/12_nov_09_Closing_Tiger-Shark.pdf |access-date=2024-01-21 |archive-url=https://web.archive.org/web/20100527140306/http://dhaka.usembassy.gov/uploads/images/hSceCcaxqZek1JcQr1LWmQ/12_nov_09_Closing_Tiger-Shark.pdf |archive-date=2010-05-27 }}{{failed verification|date=July 2024}}</ref>
*{{flag|Israel}}: [[Israel Defense Forces|IDF]] [[special forces]].<ref>{{Cite web|title=Isayeret|url=https://isayeret.com/401.shtml|url-access=subscription|access-date=2021-04-20|website=isayeret.com}}</ref>
*{{flag|Philippines}}: [[Philippine National Police]] [[Special Action Force]],<ref name="Letter">{{cite web|title=US Department of State Letter on July 7, 2004|url=http://www.pmddtc.state.gov/reports/congnotices/108/CN006-04.pdf|url-status=live|publisher=US Department of State|accessdate=2012-02-09|archiveurl=https://web.archive.org/web/20111016225158/https://pmddtc.state.gov/reports/congnotices/108/CN006-04.pdf|archivedate=October 16, 2011}}</ref> [[Philippine Army]] [[Light Reaction Regiment]]<ref>{{Cite journal|date=2007-01-22|title=The USG Is Helping Defeat the Terrorists on Jolo|url=https://www.wikileaks.org/plusd/cables/07MANILA255_a.html|journal=WikiLeaks}}</ref>{{Better source needed|date=May 2021}}
*{{flag|Poland}}: [[GROM]].<ref name="GROM">{{cite news|last=Wilk (REMOV)|first=Remigiusz|date=|title=Nowe gromy GROM|language=pl|publisher=|url=http://www.altair.com.pl/cz-art-1660|accessdate=|archiveurl=https://web.archive.org/web/20100326120026/http://www.altair.com.pl/cz-art-1660|archivedate=2010-03-26}}</ref>
*{{flag|South Korea}}: [[Republic of Korea Navy Special Warfare Flotilla]]<ref>{{Cite web|url=http://www.newdaily.co.kr/site/data/html/2015/11/19/2015111900079.html|title = 청해부대 19진과 함께하는 위대한 여정|date = 19 November 2015}}</ref><ref>Archived at [https://ghostarchive.org/varchive/youtube/20211205/necYxIVBRFM Ghostarchive]{{cbignore}} and the [https://web.archive.org/web/20210115103434/https://www.youtube.com/watch?v=necYxIVBRFM Wayback Machine]{{cbignore}}: {{cite web| url = https://www.youtube.com/watch?v=necYxIVBRFM| title = 대한민국 해군 청해부대 UDT/SEAL 저격수 함상 사격훈련 직캠 ROK NAVY UDT/SEAL SNIPER Shooting Training B-Roll Video. | website=[[YouTube]]| date = 28 April 2020 }}{{cbignore}}</ref>
*{{flag|Thailand}}: [[Royal Thai Army]].<ref>{{cite web|title=PANTIP.COM : P9190213 ԧѹͧ + Ҿѹ Ǣͧѹҧ Ҵ١ѹ []|url=http://topicstock.pantip.com/rajdumnern/topicstock/2010/04/P9190213/P9190213.html|publisher=|language=Thai|accessdate=15 November 2014}}</ref>
*{{flag|Turkey}}: [[Gendarmerie General Command]]<ref>{{Cite book|last=Neville|first=Leigh|url=https://books.google.com/books?id=LZO2DwAAQBAJ&q=Knight%27s+Armament+Company+SR-25+turkey&pg=PA6|title=The Elite: The A–Z of Modern Special Operations Forces|date=2019-11-28|publisher=Bloomsbury Publishing|isbn=978-1-4728-2431-8|language=en}}</ref>{{Page needed|date=April 2021}}
*{{flag|United States}}: [[United States Military]]<ref name="jones2009">Jones, Richard D. ''Jane's Infantry Weapons 2009/2010''. Jane's Information Group; 35th edition (January 27, 2009). {{ISBN|978-0-7106-2869-5}}.</ref>

== Gallery ==
<gallery widths="200px" heights="200px">
File:SR-25 pic01.jpg|[[Israeli Defense Forces]] SR-25 with a suppressor.
File:USMC SR-25 SAMR.jpg|A U.S. Marine general fires the Mk 11.
File:110217-G-6349A-480 MSRT Precision Marksmen Observer Team.jpg|Marksmen from the [[United States Coast Guard|U.S. Coast Guard]] [[Deployable Operations Group#Maritime Security Response Team (MSRT)|Maritime Security Response Team]] with Mk 11s
File:US Navy 100717-N-0683T-292 A U.S. Navy SEAL sniper waves to the crowd during a capabilities demonstration at Joint Expeditionary Base Little Creek, Va.jpg|Navy SEALs sniper with MK 11.
File:Magav-Facebook--Yamam-0006 (sniper).jpg|[[Yamam|YAMAM]] sniper equipped with the SR-25 Mk 11.
</gallery>

==See also==
* [[Mk 12 Special Purpose Rifle]]
* [[List of individual weapons of the U.S. Armed Forces]]

==References==
{{reflist|2}}

==External links==
{{Commons category|Knight SR-25}}
*[http://www.knightarmco.com/commercial/?term=sr-25 Knight's Armament Company – SR-25 Series 7.62 mm Rifle] {{Webarchive|url=https://web.archive.org/web/20121022001853/http://www.knightarmco.com/commercial/?term=sr-25 |date=2012-10-22 }}
*[https://web.archive.org/web/20100629122151/http://world.guns.ru/sniper/sn13-e.htm Modern Firearms Site]

{{Knight's Armament Company}}
{{ModernUSInfWeaponsNav}}
{{ArmaLite AR-10 derivatives}}

[[Category:7.62×51mm NATO semi-automatic rifles]]
[[Category:Semi-automatic rifles of the United States]]
[[Category:Sniper rifles of the United States]]
[[Category:United States Marine Corps equipment]]
[[Category:ArmaLite AR-10 derivatives]]
[[Category:Designated marksman rifles]]
[[Category:Military equipment introduced in the 1990s]]