Thanks all. I will have to owe you some close ups of the front sight when I get back, as well as a review of the CZ. But basically, Gene tapped a hole for a set screw in the MB, then turned and threaded a piece of aluminum stock about 3/8 ths inch in diameter as a front post. The set screw in the MB tightens to the barrel and the post screws down on about 1/4 inch of the screw extending above the MB, like a lock nut. Gene and I played with getting the post height right for about the center of the range of adjustment for the rear sight. Finally, another set screw goes in the top of the machined post and is backed out just enough to fill the vertical height of the slot on the rear sight. Everything set with blue LockTite.
The sight picture comes up very nicely. Too high on the front sight and you see a big, shiny aluminum post that is easy to bring in line and drop just below the notch. Works pretty well even in low light. And of course, the front post can be unscrewed and replaced with a short set screw cut flush to the MB if you want to remove the front sight. The machined aluminum post makes it much less fragile, and substantially better looking than about a half-inch of threaded bolt sticking out of the end of the muzzle.
BTW, I am sitting in the airport at CAE . . . waiting . . . oops, boarding. Bye.