I own a converted S308 (and love it), and am currently looking into building either a 308 galil, or a FAL.
I already own a 223 saiga and a golani, and my galil mags work in both my golani and my S223. 308 galil mags are ridiculously rare and expensive, and I am curious whether the mags will interchange between my saiga 308 and a galil 308.