Shotguns do not have "accuracy" they are always a random spread all at once, The accuracy stat has always been hidden but always a part of GunZ. I don't know if you can adjust the spread of SGs outside of pellets but I already made a full accuracy comparison chart here.
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https://imgur.com/a/VS9UJ
Or you can just click the link in the post above and see that accuracy in v8 is the worst its ever been. In GunZ dual minic's were accurate and strong even at Lv1 and it was a goal to finally get to lv50 minic's and have the best accuracy and dmg for revs. Revs are sniping precision weapons, just because we have an actual Sniper doesnt mean revs should get the shaft. The lv99 revs are still trashy, and I highly doubt the upgrades will do much more for it since they only make extremely marginal difference in accuracy like 1% for an upgrade of a Heavy MG. Which is a joke.
Thus far McSic or other FG staff had good intentions but did a poor execution on balancing. Revs are only part of the problem, but that's what the thread is about. It's not like any other game has never gotten balancing tweaks after official launches so expect things to change in the future, but believing they got it perfect with no real playtesting outside of their own bubble is wishful thinking and really naive, we're more in v8's public beta launch.
It would be useful to know the accuracy stats of official GunZ weapons when comparing balance in v8.