I'm new to this forum but have had several Saigas, VEPR-K, and other AK variants.
I wanted to add that I just fitted a Mojo AK/SKS apeture sight to my Saiga sporter. It took a little effort to fit it to the rifle. The Mojo pins were slightly larger and it was a small fraction of a millimeter wider where it contacts the recever but this was easy to fix by enlarging the receiver pin holes and a using a small file to smooth the receiver and make room for the new sight. Fits nice and tight - no wobble at all.
This a fully adjustible (windage and elevation) apeture sight - uses allen sc