I see the 20ga swelled up to a 12ga when you listed it for the auction and on the for sale page. Must have taken the wood panels off and found the chamber markings. Why not post photos of those on here and let us learm more about the gun please.
I didn't remove the side panels. I had taken two guns to a local gun shop and got them confused. I took the Daly back after measuring it again and realized the mistake. I thought I'd corrected that earlier but it might have been in an e-mail conversation with someone.