Ted,
You may be the only one here who owns a 581. There have been occasional posts by members curious about them, but most of us have never even seen one. I doubt it's a dog and for $400 LNIB I probably would have purchased it too. I don't know how CZ chokes their O/U, but I've hunted many years with an older Browning O/U with fixed chokes and it is no problem.