Williams Fire Sight Set Thompson Center with Octagon Barrel Aluminum Black Fiber Optic GreenWilliams Fire Sights are fiber optic light gathering sights that offer high visibility, improved sight picture and fast target acquisition. Gunsmith installation is recommended.Technical InformationMaterial: Blued Steel and AluminumAdjustments: Fully Adjustable for Windage and ElevationGunsmithing Required: NoNotes: Fiber Optic sights gather surrounding light to aid in target acquisition in low light conditions