Rise Armament Super Sporting AR-Platform Black Hardcoat Anodized Single-Stage Curved 3.50 Lbs Right The Ra-140 SST Is a High-performing, Cost-Effective Upgrade To Replace Mil-Spec triggers. It Is CNC machined From High-Grade, Heat-Treated Tool Steel And Aluminum. Included Are Anti-Walk Trigger pins. Model: Ra-140 Material: Steel/Aluminum Finish: Black Hardcoat Anodized Hand: Right