Revolver Rifles where once developed in Real Life history. They where discarded quickly because the can cause damage to the user. Whenever a revolver fires, there is gunpowder exiting the bullet chambers going forward, which is no issue in a revolver pistol. But guess what would be in front of the bullet chambers in a revolver rifle? Yep, the user's hand.
I dunno if this is a matter discussed before but I wanted to share my thoughts.