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Product DescriptionWilliams FP Receiver Sights have an internal micrometer for a click-at-a-time adjustment and are made from rust-free aluminum. The sight is marked with white tick marks for easy adjustments of both windage and elevation. Includes 1 aperture, which has an outside diameter of 3/8" and an inside diameter (peep size) of .093". The aperture is knurled for easy installation/removal. Comes with a durable blue-black anodized finish and weighs only 1-1/2 oz. Please note that some rifle receivers may require drilling and tapping for installation. For Thompson/Center Encore, Omega, G2, Scout. Fits factory drilling and tapping on top of receiver.