Well if it's like mine you remove the sight elevation screw so the sight comes up and under it are 2 screws to remove the back of the sight there is another in the front of the sight. The 3 holes left are for T/C scope mounts, or put the open sights back on.
Remove elevation screw, tap out roll pin in the front of the sight, remove remianing screw under elevation portion, remove sight and clean up holes (4) to prep for scope base.