Ruger SR-556 Takedown 5.56 NATO/.300 BLK, 16.12 in, Short-Stroke Piston, QD Barrel System, 2016
This Ruger SR-556 Takedown stands out with its quick-detach barrel system and two-caliber setup, including the installed 5.56 NATO barrel and a spare .300 AAC Blackout barrel assembly. It uses Ruger's short-stroke, two-stage piston with a four-position adjustable gas regulator for reliable operation across conditions. The rifle features cold-hammer-forged, chrome-lined barrels, a free-float aluminum handguard with a full-length T-marked Picatinny top rail, and folding iron sights. Made in the United States with forged aluminum receivers and a hard-coat anodized finish, it comes from 2016 production and includes four 30-round magazines and a Ruger-branded soft case.
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.
Rifling: Excellent Rifling - Sharp lands and grooves.
Specific Condition Notes: The firearm displays only minor surface scratches and small blemishes from handling. The bore has a bright, reflective finish.
What’s Included
- Ruger-branded soft case
- .300 AAC Blackout quick-detach barrel assembly for SR-556 Takedown with adjustable gas block and folding front sight
- Ruger SR-556 and SR-762 Autoloading Rifles manual
- Four 30-round magazines (mix of Magpul PMAG polymer magazines and metal AR magazines marked "300 AAC BLACKOUT")
The SR-556 Takedown architecture allows rapid barrel removal and caliber swaps while preserving zero, aided by dedicated folding front sights on each barrel assembly. The installed barrel is stamped 5.56 NATO with a 1:8 twist, and the included spare barrel is stamped .300 BLK with a 1:7 twist. Both are cold-hammer-forged and chrome-lined.
Ruger's short-stroke, two-stage piston system pairs with a four-position gas regulator (0–3) to tune the rifle to ammunition and conditions. The system runs on a forged aluminum receiver set with a hard-coat anodized finish, and a bright/chrome bolt carrier marked with the Ruger eagle.
The free-float aluminum handguard features a full-length T-marked Picatinny top rail, slotted sides, and a short 6 o'clock rail segment. Folding iron sights include a gas-block-mounted front and a rear sight on the receiver rail. The muzzle is threaded and fitted with a flash suppressor.
Ergonomics include a Magpul adjustable carbine stock and Magpul pistol grip, with a standard manual safety selector. The lower receiver is marked "RUGER MAYODAN, NC USA," and the rifle accepts STANAG magazines with a stated capacity of 30+1.