I don't think it will be nerfed. It's a good gun but has its own downsides. (It's quite slow to kill, which is obviously an issue for a primarily close range weapon. It also comes with very little ammo, so you will need frequent resupplies or deaths).I imagine that the very day I unlock the hellriegel will be the day it gets nerfed into oblivion.
It's a jack of all trades and very easy to use, but not as OP as people say.