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I asked Beretta at the time but they said no there wasn't a raised cheekpiece part so as far as I can tell Sako never made one and have since abandoned the detachable concept. It leaks water anyway....

You undo the butt pad screws with a phillips driver. Push the top screw in firmly with the screwdriver and it allows an overlapping lug to free up a small hook that holds the removable cheekpiece...