Ruger's AR-556 semi-automatic rifle is made from forged aerospace-grade 7075-T6 aluminum. The hard coat anodized, flattop upper receiver includes a forward assist, dust cover and brass deflector, while the handguards are made from heat-resistant glass-filled nylon. It has a carbine-length, milled gas block with multiple attachment points for a QD socket, bayonet lug, and sling. Serrations on the angled face of the gas block provides a low-glare surface. It also has a bolt machined from 9310 alloy steel, single-stage trigger, chrome-plated bolt carrier with a matte black oxide finish on the exterior, and patent-pending barrel nut and Delta ring for one person handguard removal and installation.
| Stock Description | 6 Position Collapsible |
| FireArm | yes |
| Metal Finish | Black Hardcoat Anodized |
| Action | Semi-Auto |
| Receiver Material | 7075-T6 Aluminum |
| Weight Range | 6 lbs to 6.99 lbs |
| Barrel Description | Hammer Forged |
| Weight | 6.70 lbs |
| Stock Finish Group | Black |
| Metal Finish Group | Blued/Black |
| Caliber | 5.56x45mm NATO |
| Barrel Length Range | 16" to 16.99" |
| OAL | 32.25"- 35.50" |
| Hand | Right |
| Safety | Safety Selector Switch |
| Barrel Length | 16.10" |
| Muzzle | A2 Flash Hider |
| Trigger | Mil-Spec |
| Sights | Optic Ready |
| Twist | 1:8" |
| Capacity | 10+1 |
