American M855 is not used by British troops who can only use SS109 simply because of that "pressure blow up" thing. The M4/M16 can fire SS109, but with increased rates of failure to cycle.
I'm thinking this one will cause some remarks
And trigger, I think you meant some French-speaking Belgian trooper, since France never issued the FAL. I've never even seen it mentioned for whatever French specops groups that have existed. Certainly the Legion didn't / don't use it.
Who agrees that the chief designer of the FAL had a very French name. But half of Belgium speaks French. Just ask H. Poirot!