My post is more of an inquiry. I have some astigmatism in my right eye and it's making me far sighted so I can't see normal blade and post sights too well anymore, but I can definitely use aperture sights. Anyways, my dilemma is such: I got a new Ruger 10/22 as a graduation gift and it has stock sights. The gun comes with a picatinny rail to mount on the receiver of the rifle. I put it on but I was wondering if anyone knew if I could just buy an attachable rear aperture sight and use the stock front sight without any problems or would I have to replace the front sight as well? Subsequently, if I did replace the front sight, would I need a special rear sight to mount on the rifle as opposed to just putting one on the rail at the back end closest to my face?