With a crazy-fast reset nearly nonexistent over-travel and a smoother crisper lighter trigger pull the RISE Armament RA 535 Advanced Performance Trigger (APT) helps you fire more quickly and accurately. It's highly regarded as the best of our triggers. Now available with a black trigger blade the RA-535 APT will not only improve the performance of your rifle but the look of it as well. The single-stage trigger group is easy to install. It also includes free anti-rotation pins. - Single-stage - 3.5-lb. pull weight - Unit weight: 2.3 oz. - Quick reset for faster response time between shots - Lightened trigger pull with super-crisp release to improve accuracy and increase target acquisition - Combines straight trigger functionality and comfort with curved control - Self-contained design makes it easy and quick to install with no fine-tuning needed - Anti-rotation pins included - Fits most 308 and .223 AR style platforms - Manufactured and assembled in our facility according to strict AS9100 aerospace requirements which are more stringent than standard gun manufacturing requirements - Quality-assured with high-tech inspection equipment that can measure up to five decimal places two beyond the standard and far more precise than the human eye can detect - Precision CNC machined from high-grade heat-treated tool steel and aluminum - Contained in RISE Armament's signature bright red 8625 hardcoat anodized aluminum housing - Our products are backed by a lifetime guarantee. - The set screws in the housing should be used with any trigger pins - Note: The center set screw should not be tampered with. Any attempts to modify the trigger will void the warranty. - U.S. Patent No. 7293385