Craxon, I think the guys are trying to tell you that the reason Parkers bring the premium they do is based on collectability and this one is not collectable because of the barrels. That's just the way it works with American guns. I also think most P-grades had twist barrels, which is why this one was probably sleeved.
Now since it is a 16ga O-frame, it will be more valuable as a shooter unless the sleeving ruined the balance, but it still isn't worth $2,500 to most folks. However, the real question is what its worth to you...Geo