Ok, here's the dimensions for the take off barrel.

Could I use a FN, M700, M70, M77, or Argentine?


Barrel Diameter at the Breech (Chamber): .957"
Barrel Diameter at the Threads: 1.53"
Barrel Diameter ahead of the threads at the shank (1st step up in barrel): 1.78"

That barrel in all likelyhood can be used for any of the actions you list but it does seem to be a hather heavy one.....I'd put it on a scale and see if you're sure you want one that heavy.....
I.78 is quite a large barrel shank diameter!