Radian Weapons Vertex Trigger Flat Black. The trigger bow is positioned forward of the traditional bow location enhancing the shooter s ability to make a straight-back trigger break and reducing potential for left and down or right and down trigger pull. The single stage Vertex Trigger features a crisp 3.5-4 pound break and short reset. The Vertex Trigger s bow is constructed from 1144 carbon steel and the hammer from precision machined S7 shock resistant tool steel. The hammer is then wire-EDM finished in the interface areas. The components are captured in a lightweight aluminum housing. The Vertex Trigger is compatible with the AR15 platform with a design that prevents pin walkout even when using standard hammer and trigger pins. Specifications for Radian Weapons Vertex Trigger: Manufacturer: Radian Weapons Color: Black Country of Origin: USA Package Contents: Radian Weapons Vertex Trigger Radian Weapons ACC-0017: Vertex Trigger Flat Black