The Ruger AR-556 is chambered in 5.56 NATO with M4 feed ramps provide improved operational reliability. The cold hammer-forged barrel has ultra-precise rifling for exceptional accuracy, longevity, and easy cleaning. Its upper receiver is forged from 7075-T6 aluminum and includes a forward assist, dust cover, and brass deflector. It has a Bravo B5 style black synthetic buttstock and Mil-Spec buffer tube.