Maybe I confused this idea a bit by calling it a "Kit Gun". The concept of this gun REPLACES a kit gun with a slightly bigger/heavier version in order to add significant defensive abilities. I think this gun concept would better be called the ideal TRAIL GUN.
The two most common revolving trail guns seem to be:
Some people prefer to carry a .357 in the woods for protection from animals etc. In a pinch, .38 Specials can be used to take small game but this is not ideal to a lot of people. On the other hand, some people like to carry a .22 "Kit Gun" (lightweight and small) with the primary intention of taking small game of opportunity during a walk in the woods. This .22 could be used as a last resort should you need to defend yourself in the woods but it is not ideal for that use.
The concept I am proposing has the ability to quickly deploy a .357 in a defensive manner, but with the same gun you are able to take small game. The 30oz. target weight of this gun would soak up the recoil of real .357 loads and also allow more accurate shooting of the .22. The biggest complaint of the S&W 317 Kit Gun is it is to hard to hold on target because it is too light. This concept would be most appealing to the hiker that carries for protection and would like to take small game as well but does not want to hassle with carrying/deploying a second propose-built "kit gun".