Yeah... unless you have a transverse dovetail, there's a pin holding the front sight. Go here
and look at the appropriate drill bit, replacement pin and pin punch.
Originally Posted by CZ Custom: Sights page
Fitting The Front Sight.
Remove the roll pin using the appropriate punch (30302)
Tap the old front sight out (towards the muzzle) using an appropriate soft hammer or soft block
Replace the new front sight into the dovetail and tap it toward the back of the gun until it seats in the rear of the dovetail cut. Make sure it goes all the way to the back of the dovetail.
Using the correct drill. Front Sight Drill (30308)
Drill through the roll pin hole. (IMPORTANT) Drill from the left side of the gun to the right side, Drills cut clockwise and drilling from this direction will not cause the front sight to walk out as the drill starts to cut.
IMPORTANT THE PIN MUST BE REINSTALLED IT ALSO HOLDS THE BUSHING IN THE SLIDE.
NOT INSTALLING WILL CAUSE THE BUSHING TO EVENTUALLY COME OUT OF THE SLIDE.
Replace the front sight pin, new pins are available (10091)
Please look at the Sight Cuts Photo to ascertain your sight cut PHOTO