On Armslist, I'm advertising a shotgun with ammo that I wanted to sell locally. I just got an email from someone halfway across the country who really wants it and is offering to send a certified bank check and arrange to have me bring it to an FFL to have them send it. They want my name, address, phone number to send the check. I've never sent a firearm through the mail before (or Fedex, as they're saying it would be done), but know the shipping cost can be pretty high. Should I go along with this arrangement, or is it a sign of a scam; something I heard exists plenty on Armslist?