Also known as the Black Fallout, the RA-140 SST is a high-performing, cost-effective upgrade to replace mil-spec triggers. Single-stage trigger system 3.5-lb. pull weight Clean break with a short reset Black 8625 hardcoat anodized aluminum cassette Comfortable, rounded trigger Unit weight: 2.6 oz. Manufactured and assembled in our facility according to strict AS9100 aerospace requirements, which are more stringent than standard gun manufacturing requirements CNC machined from high-grade, heat-treated tool steel and aluminum Fits most .308 and .223 AR style platforms Self-contained design makes it easy and quick to install with no fine-tuning needed KNS pins recommended (available here) but not required. If you do not use KNS pins, be sure to follow step 8 in the installation instructions linked below. To view installation instructions, watch our tutorial here or read our tutorial here Note: The set screw should not be tampered with. Any attempts to modify the trigger will void the warranty.