HELP!. I cannot remove barrels from receiver!

[Bill Kekatos]

Good evening members. Tonight I received my DH shotgun. I tried removing the barrels from the receiver, but they will not release. I cannot close the gun back either. I read another post here and I can push the cocking hook release pin with a wooden dowel or my finger, but it is stiff and requires pressure. I am not sure if it is wise to dry fire it as it is. I want to disassemble the gun so I can send it to either Kirk or Brad for strip and clean, but i cannot in the position it is now. This is my first Parker and I don't want to force it in fear of damaging anything. Do you have any suggestions? Below are 3 pics of the position it is now with the fern removed.