Truglo's Magnum Gobble-Dot Xtreme easily snaps over rib without need for screws. Endorsed by the National Wild Turkey Federation. *Note- Designed ONLY to be installed on a shotgun barrel with a ventilated or solid rib design. Fits Benelli Legacy, M1 Field, Montefeltro, Super Black Eagle, 12 ga- Vinci, Nova; Browning BPS, Gold Light 10; Ithaca Model 37 (with 5/16" vent rib); New England Topper, Pardner and Excell; Ruger Red Label shotguns; Savage shotguns; Stoeger Model 2000, P-350 Pump (all models) and Weatherby SA-08, PA-08 12 ga.