Found this when looking the k98k up.
The Mauser-type action is widely held to be the pinnacle of bolt-action rifle design, and the vast majority of modern weapons of this type, both military and civilian, are still based on it to this day
So basically this "WW2 technology" you are concerned about not working is in many respects the forefather of the modern bolt action. It is a solid design that has been replicated since its invention.
Like someone else said, keep this gun a family heirloom because it can be expected to function well for generations to come. Its old enough that if a part does not need to be replaced don't replace it.