This Ruger AR-556 semi-automatic rifle is made from forged aerospace-grade 775-T6 aluminum. The hard coat anodized, flattop upper receiver includes a forward assist, dust cover and brass deflector, while the Magpul M-Lok handguards are made from heat-resistant glass-filled nylon. It also has a bolt machined from 931 alloy steel, single-stage trigger, chrome-plated bolt carrier with a matte black oxide finish on the exterior. The AR-556 also utilizes a heavy contour, cold hammer-forged barrel and ergonomic pistol grip.