Ala Dan says the 686's aren't 19's...boy, am I GLAD!!!
I have a mid-70's production 19 that had to go back to Springfield, MA, for a "retightening" after 2,500 factory Maggies and 10-11,000 midrange .38's...my old 586...no "dash", second year production...has around 35,000 rounds thru it...almost 5K factory Mags or equivalent handloads, the rest midrange .38's...holdin' up fine, other than needing a re-blue...I've got several 686's, none with the round-count of the 586--
YET--but see no reason to believe that they are the least bit LESS STURDY than the 586...and, I believe, ALL the L's are MUCH STURDIER than ANY of the K's...and, FWIW, I LIKE the "full-lug" barrels on the L's-!!!....mikey357