I have one like this on my WASR10.
Mine did not come with the sight rings. Notice the screw in the rear of the mount. There are 2 allen head screws to hold it in place. Mine does not lose zero with a red dot sight.
There are all kind of mounts. With the side mount your 50/50. My RPK's side mount is waaayyy off. Put the same scope on another rifle and it is real close to zero.
What kind of scope are you putting on?
There is a real nice gas tube mount that I would like to try. I'll see if I can find the link.