The BirdBuster is a shotgun sight system that springboards off of our award-winning M-Series shotgun sights. It features all of the magnetic sight bases needed to fit virtually any vent-ribbed shotgun and utilizes smaller diameter LitePipes in both round and triangular configurations. The sight has the ability to quickly move from your 28 gauge over and under after a woodcock hunt to your 10 gauge semi-auto as you head out for honkers. You may have more than one shotgun but with the BirdBuster you don?t need more than one sight.BB2005-Includes three different size frames with one set of magnets to interchange for the different bases to fit virtually any vent ribbed shotgun. Incuded are 2 red litepipes (1 round 1 triangular); 2 green litepipes. Extra magnet sets are sold separately. Multiple sight frames with one set of magnets to interchange among bases to fit virtually any vent-ribbed shotgun. Includes plastic flat-pack carrying case.