buckstix,
I'm pretty sure the bolt shroud is "after market" and maybe Mauser 2000/3000, I seem to remember Gunparts Corp. having a lot of the parts left over from that model rifle. They were actually made by Heym before the Widow Heym was able to regain control of the firm. The safety would also be aftermarket, by whoever put the rifle together. I don't believe either part had anything to do with FN. As always, I could be wrong.
Mike