The model 19 and 66 built on the K frame are known as the "Combat Magnum." When the 586 and 686 were introduced Smith decided to call them the "Distinguished Combat Magnum." Since they were new and hadn't had a chance to "distinguish" themselves, in reality it's just a name. So....all the 686's are considered Distinguished Combat Magnums. Many of us here consider the 686 to be the best 357 Mag Smith has ever built.....and they have built some great one's! Enjoy your revolver, it's the best.