User blog comment:WolfgangBSC/The Random Chat Room/@comment-25373667-20150928195924

420mm Stalincannon CONFIRMED.

http://forum.worldoftanks.com/index.php?/topic/361897-found-rare-soviet-spg-with-op-gun2b1-oka/

I don't care how impractical or poor it was in field testing... it's just so stronk, no chassis the Motherland built could handle the stronkness.