When you remove the forend from the gun, look at the "knuckle", which is the part of the receiver that is normally covered by the curved end of the forend when it is in place. From the knuckle of the receiver, you should see a small pin protruding. If it is not protruding (or if it is, but not far enough) then the cocking mechanism has not disengaged from the barrels. Use some gun solvent and soak the pin and the hole in the knuckle it resides in. Then flick it, tap it, etc. until it pops out (maybe 3/16 or 1/4 in.?). This should cause the cocking mechanism to disengage so you can get the barrels off. Another trick to jar the pin loose is to dry-fire the gun with the forend removed, but it sounds like your gun isn't cocking right, so you may not be able to do that. If the pin won't protrude, let it soak in solvent overnight and try it again later.
Jim
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