I got it. Fibreforce stock is not inletted for the side scope mount. Did some hacking and wolloped it with a bigger hammer and it clicked into place .
What a PITA.
Cool, Tom. I got a Tapco stock for mine, needed to
gently sand down some areas to get the SKS back together. Just one of the things you put up with for a reliable Capitalist/Imperialistic Pig shooter made for the Glorious Peoples Revolutionary peasantry/cannon fodder.
Uniform tolerances? We dun need no stinkin' uniform tolerances!

btw, did you have a heluva time knocking the tapered pin out of the hand guard?