Ruger SR-556
Encyclopedia
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. It is one of several new AR-15 platform rifles to utilize gas piston operation.
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 folding iron sight
s, a Hogue rubberized pistol grip, and three Magpul PMAG 30-round magazines. The barrel is 16.25 inches (412.8 mm), chrome lined, and features a six groove, right hand, 1:9 inch twist.
In August 2010, Ruger announced that the rifle would be offered in the 6.8mm Remington SPC cartridge.
Semi-automatic rifle
A semi-automatic rifle is a type of rifle that fires a single bullet each time the trigger is pulled, automatically ejects the spent cartridge, chambers a fresh cartridge from its magazine, and is immediately ready to fire another shot...
carbine
Carbine
A carbine , from French carabine, is a longarm similar to but shorter than a rifle or musket. Many carbines are shortened versions of full rifles, firing the same ammunition at a lower velocity due to a shorter barrel length....
manufactured by U.S. firearms company Sturm, Ruger & Company, Inc.
Sturm, Ruger
Sturm, Ruger & Company, Incorporated is a Southport, Connecticut-based firearm manufacturing company, better known by the shortened name Ruger. Sturm, Ruger produces bolt-action, semi-automatic, full-automatic, and single-shot rifles, shotguns, semi-automatic pistols, and single- and double-action...
The rifle was introduced in 2009, marking Ruger's entry into the popular AR-15
AR-15
The AR-15 is a lightweight, 5.56 mm, air-cooled, gas-operated, magazine-fed semi-automatic rifle, with a rotating-lock bolt, actuated by direct impingement gas operation. It is manufactured with the extensive use of aluminum alloys and synthetic materials....
market. It is one of several new AR-15 platform rifles to utilize gas piston operation.
Overview
The rifle features a patent-pending, "two stage" piston mechanism as opposed to the standard AR-15 direct impingementDirect impingement
Direct impingement is a type of gas operation for a firearm that directs gas from a fired cartridge directly to the bolt carrier or slide assembly to cycle the action.- Evaluation :...
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
Chrome plating
Chrome plating, often referred to simply as chrome, is a technique of electroplating a thin layer of chromium onto a metal object. The chromed layer can be decorative, provide corrosion resistance, ease cleaning procedures, or increase surface hardness.-Process:A component to be chrome plated will...
. 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
Troy Industries
Troy Industries is an American manufacturer of firearms and firearm parts. It is the manufacturer of parts on the Smith & Wesson M&P rifle and the Ruger SR-556 and is a United States government contractor. Troy is most known for its M14 rifle parts and its M7A1 carbine, which was reviewed by the...
railed
Rail Integration System
Rail Interface System are the primary method of attaching accessories to small firearms such as assault rifles and light machine guns...
handguard and folding iron sight
Iron sight
Iron sights are a system of shaped alignment markers used as a sighting device to assist in the aiming of a device such as a firearm, crossbow, or telescope, and exclude the use of optics as in telescopic sights or reflector sights...
s, a Hogue rubberized pistol grip, and three Magpul PMAG 30-round magazines. The barrel is 16.25 inches (412.8 mm), chrome lined, and features a six groove, right hand, 1:9 inch twist.
In August 2010, Ruger announced that the rifle would be offered in the 6.8mm Remington SPC cartridge.