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Ruger SR-556 - Wikipedia

From Wikipedia, the free encyclopedia

Ruger SR-556
Ruger SR-556 - Standard Configuration (discontinued)
Type	Semi-automatic rifle
Place of origin	United States
Production history
Designed	2009
Manufacturer	Sturm, Ruger & Co.
Produced	2009–2018
Variants	SR-556 (standard) SR-556C (carbine) SR-556U (6.8 SPC) SR-556E (essential) SR-556VT (Varmint/Target) SR-556TD (Takedown) SR-762 (7.62/308)
Specifications (Standard)
Mass	3.60 kg (7.94 lb)^[1]
Length	832 mm (32.75 in) (collapsed) 910 mm (36 in) (extended)^[1]
Barrel length	409 mm (16.12 in)^[1]
Width	64 mm (2.5 in)^[1]
Height	197 mm (7.75 in)^[1]

Cartridge	5.56×45mm NATO/.223 Remington .300 AAC Blackout (Aftermarket barrel) 6.8mm Remington SPC .308 Winchester/7.62×51mm NATO (SR-762 only)
Barrels	16 in (0.41 m)
Action	Gas-operated short-stroke piston, rotating bolt
Rate of fire	Cyclic rate of fire: 800 rounds/min Practical rate of fire: Semi-automatic: 100 rounds/min Full-automatic: 250 rounds/min
Muzzle velocity	945 m/s (3,100 ft/s)
Effective firing range	800 m (870 yd)
Maximum firing range	1,000 m (1,100 yd)
Feed system	30-round STANAG magazine or 40-round box magazine
Sights	Iron sights
References	^[2]^[3]

The SR-556 is a semi-automatic AR-15 style rifle manufactured by Sturm, Ruger & Co. The rifle was introduced in 2009 in .223 Remington/5.56×45mm NATO and as a .308 Winchester AR-10 variant in 2013, the SR-762.^[4] It is one of several AR-15 rifles to use a gas piston operation.

History

Ruger announced on May 15, 2009 on the SR-556 being produced.^[5] On May 13, 2010, the SR-556C was announced.^[6]

In January 2016, Ruger discontinued all SR-556 rifles^[7] and introduced a new takedown variant, known as the Ruger SR-556 Takedown, with a lightweight KeyMod handguard in 2017.^[8]

Design

The rifle features a short-stroke piston mechanism as opposed to the semi-direct impingement system of the AR-15. Gas flow is controlled by a four position regulator. Several key parts, such as the 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 suppressor is similar to Ruger's AC-556 and Mini-14GB.^[9]

The 5.56 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 STANAG magazines. The 7.62 variant uses SR-25 pattern 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 rifle laws. The barrel is 409 mm (16.12 in), chrome lined, and features a six groove, right hand, 1:230 mm (9 in) twist.^[4]

In August 2010, Ruger announced that the rifle would be offered in the 6.8mm Remington SPC cartridge.^[10]

Criticism

Ruger's introduction of the SR-556 was met with some criticism for its high price tag of around US$2,000.^[11] Ruger products are usually known for affordability, but the SR-556 is essentially a regular AR-15, but with a piston operated gas system instead of the standard direct impingement system . It differs from the less expensive alternatives like the Smith & Wesson M&P15 Sport and Sport II model rifles, of which the original Sport model lacked a forward assist and dust cover. The SR-556 was also criticized for being heavier than other AR-15s.

Ruger addressed these shortcomings by introducing a lighter and less expensive rifle, the SR-556E.^[12]

Gallery

Firing the Ruger SR-556
Adjustable gas key on Ruger SR-556 piston rifle
Elements of Ruger SR-556 gas system
Top: Bolt and carrier for Ruger SR-556 gas piston rifle
Lower: Bolt and carrier for direct impingement AR 15 Rifle.

References

^ ^a ^b ^c ^d ^e "Ruger SR-556". Sturm, Ruger, and Co., Inc. Archived from the original on January 15, 2013. Retrieved December 9, 2012.
^ "Ruger® SR-556® Autoloading Rifle Model 5902". Archived from the original on January 20, 2013.
^ "Ruger® SR-556® Carbine Autoloading Rifle Model 5905". Archived from the original on January 15, 2013.
^ ^a ^b Gilbert, Glenn M., Ruger's SR-556: Ready To Run, Right Out Of The Box, American Rifleman, October 2009
^ "Ruger News". ruger.com. Retrieved December 21, 2023.
^ "Ruger News".
^ "Gun Review: Ruger AR-556 [Ultimate Hands-on Review] by Sniper Country". Sniper Country. September 1, 2021. Retrieved December 21, 2023.
^ Sadowski, Robert (July 12, 2017). "Review: The Discreet Ruger SR-556 Takedown". Gun Digest. Retrieved December 21, 2023.
^ Sweeney, Patrick (2010). "The Ruger SR-556". Gun Digest Book of the AR-15. Gun Digest Books. p. 131. ISBN 978-1-4402-1376-2.
^ "Ruger SR-556 Semi-Auto Rifle Chambered for the 6.8mm SPC Cartridge". www.gunblast.com. Retrieved April 17, 2018.
^ "Ruger SR-556". May 16, 2009. Retrieved March 20, 2024.
^ Cumpston, Mike. "Ruger's SR-556E 5.56mm NATO". Guns. Vol. 51, no. 12. p. 56.

External links

Wikimedia Commons has media related to Ruger SR-556.

Ruger official website

v t e Sturm, Ruger & Co.
Rifles	10/22 American rifle American rimfire AR-556 Deerfield carbine Gunsite Scout M77 Mini-14 Model 44 Model 96 No. 1 No. 3 Police carbine Precision rifle SR-556 SR-762
Submachine guns	MP9
Shotguns	Gold Label Red Label
Pistols	American pistol Hawkeye LC9 LCP MK I MK II MK III MK IV P-Series Ruger-57 Security-9 SR-Series SR22 SR1911
Revolvers	Bearcat Bisley Blackhawk GP100 LCR Old Army Redhawk Security-Six Super Redhawk Single-Six SP101 Vaquero Wrangler
Cartridges	.204 Ruger .300 Ruger Compact Magnum .327 Federal Magnum .338 Ruger Compact Magnum .375 Ruger .416 Ruger .480 Ruger
Subsidiaries	Marlin Firearms

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Direct gas impingement

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