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The SR-25 (Stoner Rifle-25)〔(【引用サイトリンク】title=Knights SR-25, Mk.11 Mod.0 and XM110 sniper rifle (USA) )〕 is a semi-automatic special application 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 7.62×51mm 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.〔 SR-25 barrels were originally manufactured by Remington Arms with its 5R (5 grooves, right twist) rifling, with twist 1:11.25 (1 complete turn in ). The heavy 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 U.S. Navy in the early 1990s; the first operational deployment and use of the SR-25 sniper rifle was with U.S. Navy SEAL snipers supporting operations in Somalia in 1993. ==History== In the late 1950s, Eugene Stoner designed the AR-10 battle rifle to equip U.S. troops. Although it was accurate for an auto-loading rifle, it lost the competition to the M14 rifle. When the AR-15 was created, patent rights for it, and the AR-10, were sold to Colt's Manufacturing Company. Colt focused on the AR-15, giving others the ability to capitalize on the AR-10 system.〔(Knight’s Armament M110: The New Breed of Sniper Rifle ) - SAdefensejournal.com, 5 January 2012〕 In the early 1990s, Stoner joined Knight's Armament Company. He continued his AR-10 design work and joined it with the direct gas system of the AR-15. The end result was the SR-25 (adding together the numbers of the AR-10 and AR-15), which improved the AR-10 design with M16A2 advancements and parts commonality. The original SR-25, released in the early 1990s, had a heavy free-floating match grade barrel with a fiberglass handguard. It had a flat top upper receiver with a 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 plated and having a captive firing pin retainer pin. The SR-25 was designed specifically to fire 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 M16-style magazines.〔 The 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 barrel that could fire M118 and M118LR 7.62×51mm NATO rounds and had a quick detachable sound suppressor mount. An free-floating handguard rail system allowed for mounting accessories. Flip-up front sights and adjustable back-up iron sights were added, and an M16A2 stock and pistol grip were used.〔 Beginning in mid-2011, SOCOM began divesting the Mk 11 Mod 0 from their inventory and replacing it with the SSR Mk 20, the sniper variant of the FN SCAR. The Mk 11 is to be completely replaced by 2017.〔(USASOC Reveals FNH-USA Mk20 Plan ) - Kitup.Military.com, 8 June 2011〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「SR-25」の詳細全文を読む スポンサード リンク
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