Lakeline fiber optic front sight works as a replacement sight for your steel front white dot sight. Fiber optic uses any ambient light to provide you a brighter sight picture. To replace the fiber, simply use a lighter to melt the ends to fit snug in the sight. Fits the following model Taurus Firearms: Taurus® G3c Taurus® G3 Taurus GX4™ FOR G3 MODELS WITH STEEL FACTORY SIGHTS. WILL NOT WORK ON POLYMER SIGHT MODEL.