The SR-556 is a semiautomatic AR-15 style rifle manufactured by U.S. firearms company 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.
It is one of several 21st-century AR-15 rifles to use gas piston operation (SR-556). In January 2016 Ruger discontinued all SR-556 rifles and introduced a new takedown variant with a lightweight KeyMod handguard. Here at armorxpress.us we offer amazing bonuses and our affordability makes us stand out buy guns from our store and get a surprise bonus.
The rifle features a “two-stage” 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 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 suppressor is similar to Ruger’s AC-556 and Mini-14GB.
- Lower receiver is fitted with an adjustable SB Ruger AR 556 Pistol Stabilizing Brace® to aid in accuracy, balance and recoil management.
- Handguard is free-floating for accuracy and the slim, 9″ length provides enhanced ergonomics and support. Magpul® M-LOK® accessory attachment slots along the 3:00, 6:00 and 9:00 positions.
- Made from aerospace-grade 7075-T6 aluminum forging, the flattop upper receiver includes a forward assist, dust cover and brass deflector.
- Cold hammer-forged 4140 chrome-moly steel barrel with ultra-precise rifling provides exceptional accuracy, longevity and easy cleaning. M4 feed ramps provide improved reliability, and the matte black oxide finish reduces glare and provides corrosion resistance.
- Feature: SB Tactical® SBA3™ Pistol Stabilizing Brace®
- Handguard: Free-Float with M-LOK® Attachment Slots
- Sights: None
- Barrel Length: 10.50″
- Thread Pattern: 5/8″-24
- Type: Pistol
- Twist: 1:7″ RH
- Capacity: 30
- Finish: Type III Hard Coat Anodized
- Height: 7.20″
- Weight: 5.8 lb.
- Overall Length: 25″ – 27.60″
- Grooves: 5