For sale are two receiver sights. Williams -- I cannot find any markings designating the model or what rifles it might fit. It mounts on top of receiver and looks like it might be for the Remington family of of pumps and autos. Hole spacing is 1/2." PRICE: $30.00 shipped. Lyman -- 57SME side-mount for Mauser, Springfield and Sako rifles with round-top receivers. Mounts on right side of receiver. Mounting screws included. PRICE: $40.00 shipped.