Fiber optic, U-Notch, rear sight attaches to the factory, rear sight ramp to improve visibility; adjusts for windage and elevation. Contrasting, red, front sight really stands out for fast pickup and alignment. 2003 & Earlier fits Remington rifles and muzzleloaders with dovetail, front sight ramps, plus all Remington shotguns. 2003 & Later fits Remington rifles and muzzleloaders manufactured from 2003 to present with 1-piece, ramped front sights. Mfg: Williams Gun Sight Aluminum, Black Anodized