Ruger AR-556 5.56mm NATO 18in Black Semi Automatic Rifle - 30+1 Rounds - The Ruger Elite 452 AR-Trigger is a two-stage trigger that offers a smooth, crisp, 4.5 pound trigger pull. It features a full-strength hammer spring for consistent primer ignition and a lightweight hammer that enables a 30% faster lock time over standard MSR triggers. Chrome-plated bolt carrier inside diameter and chrome-plated gas key inside diameter provide exceptional resistance to hot gases. The gas key is staked so that it will not loosen after extensive firing. A matte black oxide finish on the exterior of the bolt carrier provides corrosion resistance. Bolt is machined from 9310 alloy steel Made from aerospace-grade 7075-T6 aluminum forging Handguard is free-floating for accuracy Rifle-length gas system provides smoother operation and reduces felt recoil