Saw this and thought some diagrams I made earlier for my M90 build were pertinent:
I missed the safety detent-pin and spring. They're tiny, and sit on the left side of the trigger plate above the safety in a tiny little hole--don't lose them when you pop out the safety! Oh, and my 1976 has a bolt with a square head
for some stupid reason. Luckily I managed to find a metric socket that grabbed enough to break it loose.
I'm no gunsmith, so my terminology is bogus
, but hopefully these will help you out. It's always a good idea to document dissassemblies like this with photos to help retrace your steps
Here's the build so far (and my 700 SPS destined for a FAL magazine); got the dummy-stock inletted for the modified trigger/bolt release controls: