I removed the back site of mine and then just put some T/C filler screws in the hole. Actually you can use the screw from the sight itself I think. To remove it, this is an adjustable, push down on the rear sight and take the elevation adjustment scew out. The sight then opens up. Inside under the elevation bar you will see the screw that locks the sight to the barrel. Just take that out and the sight lifts off the barrel.

If it is a dove tail you have to get a punch and drive it out. I forget which way it comes out. Perhaps someone else remembers. I could guess and then tell you to do the other way because I never guess right anymore...