Do you still need help with your FCG?
I remember the AP's offered at gun shows and such during the early 90's. They were passed on as the cheaper version of the Tec 9. How many parts they truly share is beyond me, but as I understood it back then, they were nearly identical except for the lower and the sights. And the price tag of course. When I get a few minutes I will search my parts resources and see if I can find replacements.
Buffer plate
Buffer
Retaining clips
Do the springs and spring guides appear undamaged?