Jim,
Remove the forend by pulling on the finger latch and pulling off at the tip.
Then open the top lever and the barrels as if opening the breech, the barrels should come right off.
If they do not, then they are not unhooking from the cocking mechanism. This issue is not all that uncommon with Parkers. Especially if they have not been cleaned or if they are well worn or beat up.
The issue could be dirt and gunk causing the unhooking slide to be hung up. Or it could be a broken unhooking slide spring. Or it could even be damage to be trigger plate. I have seen some Parkers that the trigger plate dolls head was dented up by the 2 front screws. And those dents caused the unhooking slide to be pinched and not operate correctly.
Unfourtunately, one of the only methods of getting the barrels off if the unhooking slide will not move is to remove the trigger plate and get into the gun. You can try squiring some oil down into the water table well to see if it will free up some gunk if that is the issue.
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B. Dudley
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