Don't forget the round butt frame and the black powder chamfer on the front of the cylinder.
I have had several Mountain guns now....the 629 went to my dad who had been looking to buy one for a long time, I got a 657 when I graduated college, and the recently acquired 686+
They are all very fine guns to carry in the field. They are stainless steel/carbon steel frame with some weight saving features to make them easier to carry for long days in the field.
In my opinion, they are some of the best 'carry guns' out there (for non-CCW purposes).
How about some photos guys?