Hi-Viz Snap-On plain barrel shotgun sight is a secure fitting front sight for 12, 16 and 20 gauge shotguns with a plain barrel with no vent rib. Great for older shotguns and tactical weapons. Sight is built to rigid standards using the highest quality materials and shooter tested to ensure the sight will withstand the test of time. The LitePipes are made of a chemical-resistant material and injection molded to achieve maximum brightness and a consistent sight picture. Kit includes two green and two red round interchangeable LitePipes.