When the barrels will not come off on a 12 gauge, I have found that often one can get a screwdriver in to remove the screw that is visible in your photo that retains the barrel hook, if you apply pressure as if opening the gun or trying to remove the barrels downward. Please try to use a screwdriver that fits and not bugger up that screw. Once removed you will easily have the screw in hand but do not forget there is a spring behind the hook so don't lose it when the barrels come off. Hope this helps.
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