Side project I'm working on. Trying to keep them authentic looking. Front sight is finished. The post is SCS-able and I've made a blitzkrieg style alternate post as well. Commercially available posts are not interchangeable as I had to move the M3 slot down a few mm.
The rear sight poses more of a challenge. Drum is functional and is basically the same design that the MP22 build uses but I'm still figuring out how to make windage adjustable as there is not a lot of material there to work with. HK sells the bolts individually for these adjustments but $5 each. May try some heat-serts and some set screws to achieve the same result while not forking over $20 minimum for two bolts. For now I'm using a fixed version of the rear sight with the rotating drum.
The rear sight on the one you linked is not adjustable for windage and elevation. Only the front. So, as I said, opposite of what I'm going for. The front sight for mine is fixed and the rear will have the adjustability to mimic HKs design.