I just bought one (20 ga) and have the same question. Guy at the gun shop believed beretta chokes would fit but we never went so far as to try. Anyone know?
CZ USA O/U 12 gauge 2005 and later: interchanges with Trulock's Beretta/Benelli style.
CZ USA O/U 20 gauge 2005 and later: interchanges with Trulock's Huglu style.