The Ruger Elite 452? AR-Trigger is the perfect upgrade for any Modern Sporting Rifle*. including the Ruger AR-556 SR-556 and SR-762?. This new two-stage trigger offers a smooth crisp 4.5 lb. trigger pull and a lightweight hammer that enables a 30% faster lock time over standard MSR triggers. The Ruger Elite 452? also features a full-strength hammer spring for consistent primer ignition and includes a safety selector and all necessary pins and springs for easy installation. Packaged with an ergonomic optimized trigger-reach polymer pistol grip the Ruger Elite 452? is shipped fully assembled in a polymer fire control housing which allows the trigger to be dry-fired prior to installation and the assembly can also serve as a trigger manipulation training tool. As an added benefit the pistol grip and safety selector switch packaged with the trigger can be installed on any Mil-Spec AR rifle lower as replacement parts. * Fits any MSR receiver with .154" trigger/hammer pins. Genuine Ruger Factory Accessory