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Ruger SR-556
The SR-556 is a semi-automatic rifle carbine manufactured by U.S. firearms company Sturm, Ruger & Company, Inc. The rifle was introduced in 2009, marking Ruger's entry into the popular AR-15 market, and it would continue with a .308 AR-10 variant, the Ruger SR-762.〔Gilbert, Glenn M., ''(Ruger's SR-556: Ready To Run, Right Out Of The Box )'', American Rifleman, October 2009〕 It is one of several new AR-15 platform rifles to use gas piston operation.
== Overview ==
The rifle features a patent-pending, "two stage" piston mechanism as opposed to the standard AR-15 direct impingement system. Gas flow is controlled by a four position regulator. Several key parts, such as the short stroke gas piston, gas regulator, and bolt/carrier group are chrome plated. The bolt carrier features an integral lug in place of the AR-15's gas key. The flash hider is similar to Ruger's AC-556 and Mini-14GB.
The rifle includes a number of other manufacturer's parts such as a Troy Industries railed handguard and Samson folding iron sights, a Hogue rubberized pistol grip, and three Magpul PMAG 30-round magazines. The SR-556SC comes with three 10-round magazines and does not have the flash hider or collapsible stock, making it compliant in several states with restrictive assault rifle laws. The barrel is , chrome lined, and features a six groove, right hand, 1: twist.〔
In August 2010, Ruger announced that the rifle would be offered in the 6.8mm Remington SPC cartridge.〔http://www.gunblast.com/Ruger-SR556-68.htm〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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