You have a smoothrifle with (I think) a replacement lock. There appears to be some long ago replaced wood at the top of the front of the lock plate possibly indicating this. A look at the lock mortice may confirm it. I think it is actually a pretty nice gun gun dating to the early 19th Century and it may have been made with parts from an earlier gun but I don't think so. Please encourage your friend to not attempt to clean it or try to refinish it, the condition for a well used, long serving gun is not bad at all.
The second gun is a Belgian Flobert rimfire rifle (.22 or maybe .32 caliber?), quite common but the condition looks to be fair and complete.
I don't know how I missed these on Gunboards, must have been when I was away from the computer for a few days. I'll add your new link to the original thread and maybe there will be some more discussion.