Tired of your AR-15's gritty, heavy stock trigger pull? Here's the easy, budget-friendly way to give your rifle the trigger it so richly deserves. The RA-140 SST features a self-contained design that makes it easy and quick to install with no fine-tuning needed-and no gunsmithing required. You'll find the single-stage, 3.5-pound pull to be a significant upgrade over stock. PLEASE NOTE: KNS Anti-Rotate Pins recommended (but not required). KNS Anti-Rotate Pins prevent the trigger and hammer pins from inchwalking inch loose while shooting. Additionally, the set screw should NOT be tampered with. Any attempt to modify the trigger will void the warranty. Fits AR-style platforms built to mil-spec dimensions (calibers include .223/5.56, .308, 6.5, 9mm, and more) True drop-in installation, no gunsmithing required Non-adjustable 3.5-lb. trigger pull CNC machined from high-grade, heat-treated tool steel Black 8625 hardcoat anodized aluminum cassette Manufactured at Rise Armament's facility according to strict AS9100 aerospace requirements, which are more stringent than standard gun manufacturing requirements Includes anti-walk pins Order today!