hey man, I just picked up a vz in 556 a couple weeks ago. I finally had a chance to take it out Sunday and Monday just past.
I put exactly 500 rounds through it of Barnaul 62 grain from SFRC. I installed the AR mag well adapter on it, and I think the only issues I had were from the 4 new magazines I purchased recently from a site sponsor (I could only fit 4 rounds instead of 5, and the mag's weren't feeding very well. I ran each mag 2 times and found the same thing---but my Beowulf's and two older gi mags were flawless).
I originally purchased a vortex strike eagle//vortex mount to throw on this, but silly me never realized the scope length vs the ejection of casings would interfere(dumb dumb). So I stuck a cheap-o Tasco 5 moa red dot on it I picked up from Canadian Tire (as I was getting targets etc). Honestly, that damn thing held zero and I was able to hit that 200 m gong with relative ease, both rested on sand bag (became very easy) and free standing (harder but for a novice shooter I was happy with the hit %). It earned the 50 bucks I spent on it.
So far so good is all I can say. Time will tell. And I myself was worried about the 556 from reading all the scary reviews...but I said F it and give it a try. I'm happy so far man