Ruger SR-556 5.56mm NATO Semi-Auto AR-15 Rifle, 16 in Barrel, Adjustable Gas Piston, Quad-Rail, Folding Sights (2014)
This Ruger SR-556 is a 2014-production, AR-15–pattern rifle built around an adjustable short-stroke gas piston system. It features a 16-inch threaded barrel with an A2-style flash suppressor, a free-float quad-rail with a continuous top Picatinny rail, and folding backup iron sights. The rifle has a matte black aluminum-alloy receiver, a 6-position collapsible stock, and a rubberized finger-grooved grip with the Ruger medallion.
Condition
Overall Condition: Very good condition, showing only light, superficial signs of prior handling or use.
Bore Condition: Excellent - Clean, mirror finish, no signs of wear.
Bore Rifling: Excellent Rifling - Sharp lands and grooves.
Specific Condition Notes: The rifle shows a few minor scratches and small blemishes from prior handling.
What’s Included
- Original box
- Ruger-branded soft rifle case
- Ruger SR-556 instruction manual
- 3x 30-round Magpul PMAG AR/M4 GEN M2 MOE polymer magazines
- 1x 10-round metal AR-15 magazine
The SR-556 uses Ruger’s adjustable short-stroke gas piston system with a regulator at the gas block, providing a clean-running action tailored to 5.56mm NATO ammunition. The upper includes a forward assist, shell deflector, and ejection port cover, with a bright-finished bolt carrier and Ruger marking on the top rail near the receiver.
Its 16-inch barrel is threaded and capped with an A2-style flash suppressor. The free-float quad-rail handguard has numbered slots and a continuous Picatinny top rail for mounting accessories, and the rifle is equipped with folding front and rear backup iron sights.
The lower receiver features selector markings for SAFE/FIRE and a STANAG-pattern magazine interface with a stated capacity of 30+1. Controls are familiar to AR-15 users, and the manual safety provides straightforward operation.
Furniture includes a collapsible 6-position stock with a sling loop and an approximate length of pull from 10 to 13.5 inches. A rubberized, finger-grooved pistol grip with the Ruger medallion enhances handling. The aluminum-alloy receiver and matte black finish complete a durable, USA-made package.