Gents:
If I may add my 2 cents
What you need to determine if you want a Flash hider or comp.
Flash hidders like the Vortex do some pretty impressive things when it comes to arresting the muzzel flash. They do not howver really address muzzle jump.
Comp's, as a general rule of thumb, really address muzzle jump, however they can infact make muzzle flash more impressive.
There are some that do both, however they are a bit of a compromise.
Another thing to keep in mind when it comes to the Vz/Cz carbine platfrom, usually shooting corrosive ammo is the rule rather than the exception, and what ever muzzle attachment you get, you will want one that is eassy to maintian, and either made of, or coated with the most rust resistant material you can find.
Hope that helps
regards
AbH