I mentioned this a few months ago, there is a problem or bug with every red dot sight. the normal red dot, the MRO and the 2x red dot.
maybe you can't see it because of the resolution but there are 2 small red pixels, one over the main dot and one under. its not very game breaking but I think fixing something like this isn't that hard.
Red dot sights need this ONE fix...
Also mentioned this problem several times, yet I never had any kind of answer...
I think red dots should be redesigned anyway. The red light doesn't really look like a proper light dot, and looks more like a fuzzy red sprite.