Ruger SR-556 5.56 NATO Piston AR-15, 16.12 in Chrome-Lined CHF Heavy Barrel, Quad-Rail, Nikon P-223 Scope (2011)
This 2011 Ruger SR-556 is an original quad-rail configuration with Ruger’s two-stage short-stroke piston system and a four-position adjustable gas regulator, including a “0” single-shot setting. It features a 16.12 in cold-hammer-forged, chrome-lined heavy barrel with a 1:9 twist, folding backup iron sights, and comes outfitted with a Nikon P-223 BDC Carbine scope in Nikon P-Series mounts. The rifle is in very good overall condition with an excellent, mirror-bright bore.
Condition
Overall Condition: Very good condition, showing only light, superficial signs of prior handling or use.
Bore Overall Condition: Excellent - Clean, mirror finish, no signs of wear.
Bore Rifling: Excellent Rifling - Sharp lands and grooves.
Specific Condition Notes: There are minimal markings from previous handling and use. Please refer to the photos for a detailed view of surfaces and controls.
What’s Included
- Nikon P-223 BDC Carbine scope (fixed-power, 1 in tube)
- Nikon P-Series scope mounts (two-piece offset Picatinny)
- 1x 30-round Magpul PMAG AR/M4 GEN M3 polymer magazine
Ruger’s SR-556 pairs the AR-15 platform with a two-stage short-stroke piston and a four-position adjustable gas regulator, including a “0” setting for single-shot operation. This system provides user-adjustable gas control to match conditions and ammunition while maintaining a clean-running action.
The 16.12 in heavy-contour barrel is cold-hammer-forged from 41V45 CMV steel and chrome-lined, with a 1:9 twist and a birdcage flash suppressor. The bore is mirror-bright with sharp rifling, aligning with the rifle’s very good overall condition.
The free-float quad-rail handguard has numbered Picatinny slots for precise accessory placement. The flat-top upper includes a forward assist and an ejection-port dust cover. Internals feature a one-piece bolt carrier with an integral transfer key, and the bolt, carrier, and extractor are chrome-plated.
Furniture includes a six-position, telescoping stock (10.5 length of pull) and a textured, finger-grooved pistol grip with the Ruger logo. Folding backup iron sights provide a low-profile aiming option when not in use.
Optics are ready to go with the included Nikon P-223 BDC Carbine fixed-power scope mounted in Nikon P-Series two-piece offset Picatinny mounts. This pairing complements the rifle’s 5.56 NATO chambering and flat-top rail layout.