Designed to fit most shotguns with a ventilated rib. This front sight can also be used for shotguns with a press fit front sight bead (if the rib is drilled and tapped for attaching screw). It includes a durable base, interchangeable green and orange fiber optic inserts, and 5 attaching screws in different thread sizes. No gunsmithing required. Instructions are included. Manufactured by Allen Company.