I really admire 4" Revolvers. Especially after having to let my Ruger Police Service Six in SS go to another home years ago.
Always liked the 686, started combing around for one, but always came across ones with the internal lock.
Working in another part of the state, I finally found one at a fair price.
The SA trigger is downright scary light. Adj. rear, and very smooth DA. This one was hardly used and in exceptional condition.
The manual calls it the Distinguished Combat Magnum
modeled after the Model 66 predecessor. It is a stout and very comfortable pistol to shoot full house loads in, and very accurate.
Love these 4" revolvers.