most people don't think much of this tank but when you suddenly get barraded by shells every 4.45 seconds they notice that it does really start to hurt after a while
you can see the setup I am using on this tank and as you might have noticed i am taking the DPM to the absolute limit (including field mods). The highest DPM you can currently have on a K-91 is 4.317. That's a lot. The gun handles very nice as well and is pretty accurate too.
If you've been playing this game for some time, you can confidently say that you know a thing or two and you're getting bored of the stale hull down meta, I would really recommend this tank. I've been having a lot of fun with it and might even consider trying to get that third mark of excellence.
Source: https://www.reddit.com/r/WorldofTanks/comments/q2o7k4/k91_is_underrated/