Someone correct me if I'm wrong, but the first one to come to mind was the Smith & Wesson J-frame kit gun - I believe they made a 2" barrel version w/adj. sights. As for a current model, I think S&W is making a 3" barreled airweight J-frame .22lr w/adj. sights. I think either would make a great lil' trail gun! As far as auto's go......?
Hope this helps!
Del