Here's one of them wearing dual speedloader cutout Checkered Target stocks. When I bought this gun, it came with set of very plain standard Checkered Targets; these are not full of figure but they have three-sided bookending. I was told the original Bill Davis grips were hard to find and quite costly if you lucked into one. I found a new one on eBay for $18.
I think the five-inch barrel is the best length for overall handling. For a few years, I sought out a five-inch 629 Classic DX, a one-year offering close to 30 years ago. When I finally found one, I paid less for it than this 686NM set me back. I can believe someone did some work on the action of this 686 as it is perfectly smooth and the trigger breaks like thin glass but the person from whom I bought it swears it came out of its case like that.
By the way, I found both of those guns on GunBroker.
Ed