John,
We need more information. While Bob's advice is all correct, if I understand your predicament you have a different problem than what he is addressing. I understand that your problem is that the gun won't even open, not that you just can't get the barrels off. Do you have fired empty shells in the gun? If so, they may be stuck in the chambers. Sometimes the case rim is slightly oversized and the case rim sticks in the chamber recess, preventing the gun from opening. I'd take the forend off and try to open the gun. If it still won't open and there are empties in the chambers, open it as far as it will go and use a long dowel or rod inserted in the muzzle until they bottom against the empty hulls and try and tap them free of the chamber as you try and open the gun further. I sometimes have hulls stick in the chambers and a little extra force will break them free and the gun will open (extractor guns, though). But since I am familiar with the problem and know what it feels like when it happens, I know I'm not risking any damage. Until you know what is going on, proceed cautiously with any applied force. If none of this works for you, or if it doesn't apply to your situation please reply back with more details.
One more thing - it appears you have an ejector gun. You mentioned dropping the hammers to get the barrels off before (in which case, Bob's advice is correct about why the barrels wouldn't come off). Were the ejectors cocked when you put the forend back on this last time? You didn't have to force anything to get the forend back on, right?
Jim
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