Hi Viz AR15 Fiber Optic Front Sight - All HI VIZ sights are built to rigid standards using only the highest quality materials, then shooter-tested to ensure they'll withstand the test of time. LitePipes are made of a chemical-resistant material and injection molded to achieve maximum brightness and a consistent sight picture. Made using the highest quality materialsTested for durabilityProvides maximum brightnessAR15 Interchangeable SightIncludes 4 LitePipes 2 red 2 greenSight adjustment tool tapered detent and carrying case for spare LitePipesFits AR and M4 type rifles with A Frame or folding front sight