Its not an FAL derivative, its brother to the Browning BAR.
There are changes to the mag and mag well, proprietary mags no less.
Not gas piston as one would think but action bars that run along the sides of the receiver interior.
Certainly not as sturdy as an FAL, but more accurate.
I’ll stick with my FAL, I can build them cheaper and they’re more ergonomic, at least for me.