Allen Front Shotgun Sight for 5/16" Rib Remington/Benelli Fits 5/16" ribbed shotguns, including 12 gauge Remington and Benelli guns Clamps to the rib without drilling or screws Spring steel frame Fiber optic blade material Patented Fits 5/16" shotgun rib 12Ga Remington and Benelli Guns clamps to rib without drilling or screws