My suggestion is that you do nothing about your rear sight (except drift it to either side if necessary). If you need to to change the elevation you need to replace the front sight, taller if hitting high, shorter if you're low. I bought the high plain black front sight from czcustom.com and then adjusted by careful filing, I didn't like the original fiber sight that came on the gun. Make sure you buy a front sight pin as well if you buy a new front sight.