This is a replacement aperture for the Remington rimfire rifles that were designated with the "P"suffix which were called there target guns. Some of the models included the 550P,510P,511P,512P,341P,41P. This sight used two apertures. The spare aperture was screwed into the left side of the gun and was used to lock the elevation. The peep holes were .050 and .080....one target and one hunting. We will send the .050 unless you ask for the larger.The complete is not for sale. Aperture is pictured on the sight....again the sight is not for sale.
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