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.
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| Metal Finish Group: | Blued/Black |
| Action: | Semi-Auto |
| Caliber: | 5.56x45mm NATO |
| Model: | AR-556 |
| Max Capacity: | 10 |
| OAL: | 32.25"- 35.50" |
| Operating System: | Direct Impingement |
| Sights: | Optic Ready |
| Length of Pull: | 10.25"-13.50" |
| Stock Material: | Synthetic |
| Safety: | Safety Selector Switch |
| Muzzle: | A2 Flash Hider |
| Stock Description: | 6 Position Collapsible |
| Grips: | Black Polymer |
| Handguards: | M-LOK |
| Twist: | 1:8" |
| Hand: | Right Hand |
| Thread Pattern: | 1/2"x28 |
| Barrel Length: | 16.10" |
| Receiver Material: | 7075-T6 Aluminum |
| Trigger: | Mil-Spec |
| Stock Finish Group: | Black |
| Barrel Length Range: | 16" to 16.99" |
| Magazine Type: | AR-15 |
| Stock Finish: | Black |
| Barrel Finish: | Matte Black Oxide |
| Capacity: | 10+1 |
| Barrel Description: | Steel |
| Receiver Finish: | Black Hard Coat Anodized |
| Weight: | 6.70 lbs |
| Weight Range: | 6 lbs to 6.99 lbs |
| Gun Platform: | AR-Style |
