So I bought a saiga that was converted in the rear only. Looking at the front, the fsb is slightly canted. But, the rifle is dead on at 60 yards with the sight post pretty much centered in the fsb. Further investigation shows the rear sight block is slightly canted and on top of that, the rear sight blade is tilted a bit in the block. The pivot on the blade doesn't sit fully in the notch in the rsb.
So I'm guessing at the factory with all that, they left the fsb canted since it shoots poa as it is.
Now I am going to put on a bulgarian fsb with 24mm threads. Should I just put it on can