3" K frames seem t look and carry just right; well balanced, etc. The round butt is generally more flexible for carry, too - a little easier to conceal. If one has bigger hands, there are stocks that fit RB frames that are more like square butt frames. One of the "gifts" from my mom is relatively small hands for a 6' male, so I had my 4" M66 chopped to RB and it works very well. My old eyes do not do well with most S&W revolver fixed sights (too slow to acquire for serious use), but some folks do well with them. Do some training/testing and see how they work for you. There are good options for my visible front sights if needed. Least work is a good quality bright model paint on the front sight. I like XS Big Dot tritium, personally, and there are folks who do make more visible rear sights too.
Enjoy!
