HIVIZ Wide Magnetic Fiber Optic Shotgun Sight with Green Light Pipe Fits: ribs from .328 to .437 (21/64 to 7/16) (8.3mm to 11.1mm) LitePipe color: green LitePipe shape: round Litepipes are not interchangeable Magnetic base sight to fit ventilated shotgun ribs from .328 inches to .437 inches Includes one green LitePipe Fits Winchester all post 1964 pumps and autoloaders Mossberg all (except ported models) Browning Citori target grades (except super wide ribs) Beretta S682 Comp and trap guns HiViz recommends gunsmith installation for all dovetail sights. Due to manufacturing tolerances, some firearms may require additional fitting.