HIVIZ HIVIZ Glock Interchangeable Fiber Optic Front Sight Glock interchangeable front sight Includes 6 LitePipes in red and green .080 inch diameter Carrying case for LitePipes Fits all Glock models except ported or compensated models HiViz recommends gunsmith installation for all dovetail sights. Due to manufacturing tolerances, some firearms may require additional fitting.