I have seen mention of a reciever sight for the CZ's, but no specific manufacture or photos'. I too have considered removing the express sight, filling with a blank and installing a ghost ring aperature sight on the rear bridge. If anyone has info on these, I too would appreciate a post. Would like one that will install on the stock reciever with little or no modification. Not too interested in a sight that requires milling, or a lot of screw holes and such. I have seen catalog references to the New England Custom Guns sight for the Ruger,but do not know if it can be adapted to the CZ reciever. Someone must make one or should!