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. 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.Key FeaturesSingle-stage3.5-lb. pull weightUnit weight: 2.3 oz.Quick reset for faster response time between shotsLightened trigger pull with super-crisp release to improve accuracy and increase target acquisitionCombines straight trigger functionality and comfort with curved controlSelf-contained design makes it easy and quick to install with no fine-tuning neededAnti-rotation pins includedFits most 308 and .223 AR style platformsManufactured and assembled in our facility according to strict AS9100 aerospace requirements, which are more stringent than standard gun manufacturing requirementsQuality-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 detectPrecision CNC machined from high-grade, heat-treated tool steel and aluminumContained in RISE Armament's signature bright red 8625 hardcoat anodized aluminum housingTo view installation instructions, watch our tutorial here or read our tutorial hereOur products are backed by a lifetime guarantee. If you have any issues with a RISE Armament product, please email us [email protected] set screws in the housing should be used with any trigger pinsNote: The center set screw should not be tampered with. Any attempts to modify the trigger will void the warranty.U.S. Patent No. 7,293,385