I made a "poor man's" peep sight for one of my Turks. I bought an extra rear sight, Dremeled a crosswise groove in it, soldered a small washer in it & applied some cold blue to it. Good enough that I can hunt quite effectively with it and much easier to target shoot than the stock sights. It's a bit crude, but it works and it's totally reversible. Now, the one in your post is certainly nicer looking and better functioning with it's adjustability. I just whipped out something cheap, easy and quick.