Century Arms FN FAL

So I posted in the FN FAL sub-forum about this piece and I learned some more information about what it is and what it's been cobbled together from. I don't have a real interest in keeping it, but I am totally unsure of it's value.

A co-worker is offering me to trade for some rifles that I am interested in, but I don't know what to offer so that one of us isn't getting had.

I would just like to know a fair value on it as some friends of mine are insisting it's worth more than my co-worker is offering.

Thanks for any help in this matter.

Well if it helps and it's not too late, I just bought a new Century FAL from the local gun shop for $750. It's metric and in a lot better shape than that one.