Easy Install 5/16" Rib Shotgun Front Sight If you want to increase your accuracy in the field whether you're hunting upland birds, waterfowl or turkeys, get the patented Front Shotgun Sights by Allen. They are designed specifically to fit 5/16? Remington and Benelli 12-gauge shotguns. The frame is spring steel which clips onto the top rail and the blade is fiber optic material. Allen Illuminated Shotgun Front Sight Specifications and Features: Rib attachment replacement front sight Spring steel body Green Fiber Optic Fits: Remington, Benelli and similar 12 gauge shotguns with 5/16" barrel rib