Robert,
Do the serial numbers on the barrels and receiver match? Sometimes this situation occurs when barrels from another gun are mated without proper fitting.
In any case, if you continue to be unsuccessful, there is another thing that you can try. Open the gun and look on the left side of the barrel lug for a large-headed screw like the one the arrow points to in the picture. See if your gun will open enough to allow clearance for the screw head so that you can remove it. If so, you are lucky! (Some guns do, and some don't, and I haven't determined the reason for that yet). With a PROPERLY fitting screwdriver, carefully remove that screw and the barrels will come off. It is what attaches the cocking hook to the barrels, so you will be leaving the cocking hook in the receiver. Hopefully with the barrels out of the way you will be able to then work the cocking hook loose from the bellcrank in the receiver that it snaps into when you put the barrels on the gun.
Jim
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