These look like winners to me--especially since they say it is designed for easy barrel switch out. I only have one CZ and it's a rimfire, but the manufacturing quality and finishing is superb throughout (and not surprisingly, so is the accuracy) and I may have to test the waters with one of these. Gauranteed sub .75 MOA 5 @ 100 meters shots with good factory ammo.
Bud's (as does CTD) has an alpha 6.5 PRC for $700--that's what I would get, but I've had issues with Bud's shipping, hmmm.
Looking at the pictures of the 600 I don't see any kind of barrel nut--curious as to what their system is for changing out barrels.
There are some YouTube videos showing a cz600 barrel swap. There are some retaining screws close to the breech end. Loosen the screws and off the barrel comes, or so they say.