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 Beretta AL390, AL391 Urika, A391 Xtrema, A400 Xplor Unico KO; Benelli Legacy, Montefeltro, Nova 20 ga.; Browning Gold series and A5; Franchi Field Models; Weatherby Orion/Athena O/U 20 ga and Winchester Super X3 shotguns.