New to Forum with Parker issue....

[Pittypatdugan]

See if the forend will come off, and the barrels should drop down as you push the top lever to the right . Certain shells expand to much when fired and this causes the problem

[EdThompson]

Thanks to those who responded. The spent shells had expanded. By turning the gun upside down and trying to close it tight then removing the forend I then was able to turn the gun up right on a padded table and move the lever enough to unlock the barrels. One of the shells had expanded so much I had to pry it out. Thanks for your help.

Ed