The email issued mentioned earlier this week is now fixed! You may also have received previous emails that were meant to be sent over the last few days - apologies, this was a one time issue and shouldn't happen again!
I have the EGW HD mount on mine. Very stout and secure. I don't care for the rails that secure with the screws from the top. Just my personal preference.
The best is Murphy’s. Pricey. Mid line is EGW and works great. Dip is fine and least expensive way to go. Pick your poison. Seekins rings are my fav. I think I used lows on my Cz and found some used ones for under a hundred.