The only gun I have ever heard of with the Nazis that involved a bent barrel was an SMG prototype for tank crews where the idea was that they could spray it out at anyone on their tank while still being protected inside.
Forgotten Weapons has a video about it - mainly about the less extreme 30 degree bend version for urban combat, but also mentions the 90 degree bend version intended to be installed in vehicles.
Forgotten Weapons has a video about it - mainly about the less extreme 30 degree bend version for urban combat, but also mentions the 90 degree bend version intended to be installed in vehicles.