the main gun groups are long gone. OK guns for sale and guns of Oklahoma. There was a thread last week about this. Most people were like "so what, FB sucks" but I personally will miss them. It was nice selling something the same day you listed it.
Several ways around it, several gun trading pages are still up. Several started up with new names when the word first got out. Someone even started up a new site similar, I don't have the link at the moment.
Two of our local pages are either down (read: gone), or have "moved", or have changed names. In any event, these changes simply mean less traffic on the site in question. Changing the name may or may not make it harder for FB to find the site, but it sure makes it harder for everyone else to find.