To the original poster. At first I felt about how much I like shooting irons so I bought another slide for my 75Bsa and had CZC machine it for their mounting plate. I have never once put the iron sight back on to shoot. I’m a dot guy now. Then I got another BSA and again I just had CZC machine it for their plate…but also bought their “cap” that screws in place of the machined in red dot plate that when mounted mimics the factory slide and allows you to mount a Heine rear sight just as OEM. Yup o like Heine sights also!! And guess what I’ve never mounted that cover plate with a Heinie sight once also. I’ve now had CZC plates on many of my CZs. Look up the CZ Custom web site and look at them. The bigger difference you will be faced with will be do I want to remove the Firing Pin Block system to mount the plate lower or do you want to leave the FPB system that requires the plate to be slightly higher vs the none. Also know their plate system is dove tailed into the slide, uses two larger screw to mount the plate , AND the extractor pin passes through the plate into the slide so that plate does not ever move. The same thing with the iron sight cap/cover so a zeroed rear sight will ALWAYS keep the zero because again the extractor pin passes through it. On my SP01 I chose maintaining using the FPB of the production class rule. Can’t tell the difference between the lowest plate mount and the system above the FPB pin for the plate. I laugh all the time about people talking about how much higher a plate mount vs a direct mount…. Remember when you mount a RDS like say a RMR and then mount a 507 comp because of that large window the “dot” to the top of the slide is higher (with a 507 comp) than the smaller windowed RMR. Not many people even say a word about that

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So cut it and get a CZC red dot plate machined into your OEM slide at the height to keep the firing pin block intact..AND buy a rear sight mountable cover/plate. Call Stuart at CZC and you won’t be disappointed even slightly. Now the one thing the CZC plate does not allow for is a co witness setup.
I’ve never needed it so I don’t miss it ever.