Ruger 8537 AR-556 5.56x45mm NATO 10+1 16.10″ Heavy Contour Barrel Black Hard Coat Anodized 7075-T6 Aluminum Forgings 6 Position Collapsible M4-Style Stock Mil-Spec Buffer Tube Optics Ready

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.