The Marble Arms .500" Fiber Optic Front Sight model 50-MR features bright orange fiber optic technology for enhanced target acquisition and accuracy.Marble Arms 50-MR Front Sight.500" aperture size for precise aimingFiber optic glow technology for low-light visibilityDurable steel construction with orange fiber insertDesigned for rifle applicationsIdeal for hunters and sport shooters seeking improved sight visibility and faster target acquisition in varying lighting conditions.