I think I paid $2,000 for a 32" O/U with Briley tubes and Pro-Ported in new condition.
The picture above that MIA listed does not show the MX14 barrel, but the look similar, non-adjustable rib.
You could get $2500. It's shown with the Schanble forearm, so I'm thinking it may not be an MX14. The MX14 is only a trap model and was never sold with this type of forearm.
More, of course, if the wood and forearm metal comes with it as shown.
I could be wrong, but don't think so.
Whiz