The Ruger AR-556 is an affordable" American-made modern sporting rifle with the rugged reliability that you have come to expect from Ruger. Made from 7075-T6 hard-coat anodized aluminum forgings" shot-peened and proof-tested 9310 steel bolt" and 8620 steel bolt carrier. The inside diameter of the carrier and gas key are chrome plated and the key is staked for longevity. 11" aluminum handguard is free-floated for accuracy and features Magpul M-LOK accessory attachment slots along the 3:00" 6:00 and 9:00 positions with additional slots on the angled faces near the muzzle. Flat top upper receiver features a Picatinny rail for easy attachment of magnified optic" red dot or open sights. Single-stage trigger provides durable and reliable fire control. The enlarged trigger guard is designed to allow gloved shooting in cold weather. Six-position" telescoping" M4-style buttstock and Mil-Spec buffer tube allow the rifle to be properly sized for different shooters or varying levels of outerwear. Equipped with a heavy-contour" cold hammer-forged 4140 chrome-moly steel barrel with ultra-precise rifling provides exceptional accuracy" longevity and easy cleaning. M4 feed ramps provide improved reliability" and the matte black oxide finish reduces glare and provides corrosion resistance. This model ships with a 10-round magazine for consumers in those states which limit magazine capacity.