Thanks. I bought the 6 inch barrel directly from CZ USA ($145.00) and had a friend cut and thread the barrel. The barrel needs fitting, but it is not difficult. I took it real slow with a knife sharpening tool and removed only enough metal to make a solid lock up. It took approximately 3 hours to fit the barrel, but I could do it much quicker since I now know what to look for. It fits better than my stock barrel and no break-in needed (with or without the suppressor). I was kind of surprised by this as I thought a break in would be required.
The sights were pretty easy to replace - no issues whatsoever. It did make me a little nervous while pounding them out and in. In addition, I added a 20lb Browning Hi Power spring (from Wolf) and cut a few coils off of it (the CZ recoil spring is 14lbs from the factory). My thought was to try and minimize ejection port noise with a stronger recoil spring. Not sure if it made a difference since I have not used the factory spring with the suppressor.
ETA: the CZ barrel is .503 in diameter so the suppressor must index on the muzzle (barrel diameter does not allow a shoulder).
Dan