The 66 sight is designed for mounting on flat receivers, such as lever action rifles, like the Winchester 94, Marlin 336 or modern shotguns. Features include 1/4 minute audible click micrometer adjustments for elevation and windage, quick-release slide, coin-slotted "stayset" knobs and two interchangeable aperture discs (large hunting aperture and small target aperture) for any shooting condition.