Troy,
Dean Romig, a Life Member here, sell a neat little "plastic" tool that slips between the end of the forend and the underside of the barrel. It gently nudges the forend free. Dean's is great but you could of urgency make one from a thin piece of wood etc.
If this process does not work on your 578 then the release plunger in the forend needs adjusting.
Bob Jurewicz
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