Done this on all my CZ/Brno to fit Recknagel (NECG) peeps. Just loosen the screw and tap the sight out, it does not matter from which side except for the sake of convention.

Then, if you have time on your hands, make yourself a steel plate that just fills the sight base flush and tap it in place, that will feel more comfortable when handling the rifle - the edges left when the express sight is off are rather sharp.

In my experience the NECG sights tend to be high, and you may have to change the front sight as well. Try a red fiber optic sight, you'll be amazed by its visibility and how fast you get it on target.

For fast and close work, you may want to drill out the aperture to make more of a "ghost ring", 2.5mm should be enough. But for normal hunting/shooting, leave it as it is.

Also, I smooth all the sharp corners on the sight's "wings"... These are deadly for your knuckles and thumb web!

These are extremely well made and sturdy sights, you'll like them!