Introduced in 2014, the Ruger AR-556 has become one of the most prolific, affordable modern sporting rifles on the market, and now comes equipped with Magpul MOE Furniture. The AR-556 is constructed from top-quality components, including forged 7075-T6 aluminum upper and lower receivers and a cold hammer-forged chrome-moly steel barrel with M4 feed ramp cuts. Chambered in 5.56 NATO, the AR-556's carbine-length, flat-top, M4 design is fully configured with a Ruger® Rapid Deploy folding rear sight, milled F-height gas block with post front sight, forward assist, dust cover, and brass deflector. The Ruger AR-556 was extensively tested during its development, with over a quarter million rounds expended during the final validation, endurance, and Ruger "jury" testing. he AR-556 is an affordable yet well-equipped M4-style Modern Sporting Rifle from Ruger - one of the most trusted names in American firearms.