Put a proven HiViz MPB Sight on your plain barrel shotgun and enjoy the advantages of a light gathering resin sight. Enjoy better sight visibility and faster target acquisition in all lighting conditions. This unique snap-on sight base fits all 12-, 16-, and 20-gauge shotguns without ventilated ribs. Sight features four interchangeable litepipes you can match to the hunting situation and your preferences. Two red litepipes, two green litepipes. Litepipes also come in two different diameters. Snap on sight fits all 12-, 16-, and 20-gauge shotguns without ventilated ribs Light gathering resin sight improves visibility and target aquisition speed Sight comes with four interchangeable litepipes Two red, two green - Large and small diameter