Sturm Ruger AR-556 5.56 NATO Semi-Auto Rifle, 16" Cold-Hammer-Forged Barrel, Free-Float M-LOK, FDE Furniture
This 2021 Ruger AR-556 stands out with a cold-hammer-forged 16" 4140 chrome-moly steel barrel, a free-float M-LOK aluminum handguard with a continuous top rail, and forged 7075-T6 aluminum receivers finished in Type III hard-coat anodizing. It ships in excellent overall condition and includes a 30-round Magpul PMAG.
Condition
Overall Condition: Excellent condition, showing only faint signs of any prior use or handling.
Bore Condition: Excellent - Clean, mirror finish, no signs of wear.
Rifling: Excellent Rifling - Sharp lands and grooves.
Specific Condition Notes: Light indications of prior handling are present. The bore is clean and shiny.
What’s Included
- Sturm Ruger AR-556 5.56 NATO semi-automatic rifle
- One 30-round Magpul PMAG polymer AR-15 magazine
The rifle uses a semi-automatic, direct impingement action and is chambered in 5.56mm NATO. The 16" barrel is marked "5.56 NATO 1:8" and is threaded 1/2-28 TPI, capped with an A2-style birdcage flash suppressor. The 1:8 RH twist supports a wide range of common 5.56/.223 bullet weights with well-defined rifling.
The free-float M-LOK handguard is aluminum and integrates a continuous top rail aligned with the flat-top Picatinny upper, providing uninterrupted rail space from the receiver forward. The upper receiver includes a forward assist, ejection port cover, and brass deflector.
The lower receiver is forged 7075-T6 aluminum with Type III hard-coat anodizing and carries the Ruger phoenix logo with "RUGER MAYODAN, NC USA," model marking "AR-556," and selector markings "SAFE"/"FIRE." The manual safety is standard.
Furniture is FDE, including a 6-position collapsible stock and an A2-style polymer pistol grip. Capacity is 30+1 with the included 30-round PMAG. The handguard is marked "MADE IN USA" on the left side near the receiver, adjacent to the M-LOK logo.