Thanks for the advice, partner! It is interesting to hear your experiences with flap-closure vs. bungee-retention pouches. I actually developed my aversion to open-top pouches from experience as well, having pouches get packed with dirt and debris, as well as leaves and pine needles. I am especially concerned with keeping the magazines undented and free from dirt, given that I carry Vz. 58 mags (just as I do with any rifles meant to be reloaded and charged with the right/firing hand) rounds-up.
I have indeed searched on this forum and found great info on pouches for Vz mags, but the Polycarbonate (very strong and well-made, quickly becoming my favorites) has a thick-enough base and wide-enough walls that it is a different animal entirely, when trying to fit into mag pouches. The Czech camo pouches that retain even the AC-Unity mags well, and out of which the aluminum surplus slide right out, can neither fully hold nor fully close with the polycarbonate mags.
I will keep looking for a fully MOLLE-compatible pouch that is curved for 7.62x39, and maybe has some extra height. Perhaps taking a couple polycarbonate mags to the gun show and trying them in person will be helpful.
I also am of the opinion that I am not trying to carry maximum amounts of ammo when loading out with 7.62x39. I consider the Vz. 58 to be ideal as a backwoods survival rifle, and that is the capacity in which I would load it out. While I would be very comfortable defending family and liberty using it, I prefer another platform for that. The Vz is light, short, handy, and is powerful/penetrative enough for any game/dangerous animal I might encounter in the high Appalachians (I trust it much more than the 5.56 in the survival role), which is where my wife and I have a ranch and a bunch of land, and is our chosen stomping ground/homesteading environment. It can also be loaded from the top with stripper clips, and is easy to service and clear of debris or jams. Given this role, I only plan to carry four mags on my belt, whereas with my ARs, I am set up to carry 6-8, not counting the chest rig, extra mags in the backpack, etc.
If I know I am going into a defensive situation against two-legged predators, I am almost certainly grabbing one of my ArmaLite AR-10s with 6-8 20- or 25-round magazines on the belt, and perhaps a chest rig with another four. If I were going to be defending the homestead in tandem as a team with my wife (tall, petite Asian woman who is a bit overpowered by an AR-10, but is in her element with an AR-15, Kalashnikov, or Vz), I would roll out with one of my 20" AR-15s and 8 mags on the belt, with 8 more in the chest pouch, so that I could share ammo/mags with my wife using her ultralight 16" midlength.
Finally, I am curious as to your low opinion of the AC-Unity mags. When I first got into the platform, I researched various polymer mags, and decided that the consensus on the FAB-Defense was that it was not worth my time, but that the AC-Unity likely was, as well as the Polycarbonate. I have put a few AC-Unity through their paces, and have actually been quite impressed. There are two complaints I have about the AC-Unity, but those do not detract from its utility as a reliable ammunition feeding device. My first, and less-serious, gripe is that the follower puts the last round in the mag on the left (the opposite of the surplus and polycarbonate), which makes it harder to load for a right-hander (much like loading a Garand clip with the top round on the left instead of the right). My bigger issue is that the feed lips on the AC-Unity mag lacks the cutouts for the stripper clip that allow the rifle to be loaded/topped off easily with the bolt locked open and the magazine in the action. This does not detract from the ability of the magazine to be used like a traditional AR or AK magazine, but negates the extra functionality the Vz. 58 gives the user by allowing stripper clip reloads. As far as reliability, however, the AC-Unity units have performed flawlessly for me with a decently-high round count, and have always locked the bolt back after the last round.
