how does it balance with that stock? I heard they were a mite weighty, albeit they looks so sweet and spacy.
You heard wrong.
The Vz58 (in stock form) is over a pound
lighter than a stamped-receiver Kalashnikov.
Yes, the Vz58 has a milled receiver.
Yes, the Czechs are excellent gunmakers.
. . . and "yes", after you install rail systems and hang 14 pounds of crap on it, it'll get "weighty".