Hey 9mmgunguy, I linked a youtube video of the way I removed my rear sight. it's not my video, just one I found.
https://www.youtube.com/watch?v=dDKVSeT3oiY
Here is a pic of where the cases hit the rail, the silver dings. It hasn't changed the trajectory of them at all. They still fly high up and to the right. 100's of rounds through with this rail on and not one malfunction because of it.
And here is a pic of my red dot mounted. I have lifted the rail up to strip my rifle down for cleaning numerous times and the red dot has never shifted in zero.