Williams Twilight WRGS Rear Sight Aperture 3/8" Diameter 0.150" Hole

Williams WGRS apertures have a long shank to fit the WGRS receiver sight with long shank. The Twilight Series are designed for shooting under poor light conditions. They create a sharp contrast that gives quick definition to the aperture hole. Lighter colored ring around aperture creates a a sharp contrast to give quick definition to aperture hole in low-light conditions; also eliminates "fuzz" which robs clarity.