Jerry when you have the triggerplate off check the unhooking slide ( it is at the front of the plate and slides in a mortise). sometimes it is stuck by crud or rust and won't slide forward when the forend is off. There is a small tab at the front that pushes the cocking hook forward to release it from the cocking slide, I have seen it broken off. At times the rod that pushes the unhooking slide back when the forend is installed is stuck in the back position and won't allow the unhooking slide to move forward when the forend is removed. In my experience these are the only things that would stop you from removing the barrels. You might also check the cocking hook to verify that it is the original one for the gun, there is usually a # on it.
Jim A.
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