I have had, in the past, a two-inch Model 10, a three-inch Model 13...wish I had it back, come to think of it...and a two-and-a-half inch 19 and a 66 w/same barrel length...to my way of thinking, the THREE-INCH "K's" are the way to go...Model 10,12,13,19 or 66...after having used the two and two-and-a-half inch barreled guns, I believe the IDEAL "K" snubby would be a THREE-INCH Model 13/65--if you like fixed sights--or a THREE-INCH Model19/66--if you prefer adjustable sights, like I do...the guns I have always been most ambivalent about are the TWO-INCH "K's"...the Model 10/64 and the Model 15,especially...if you're going to have the larger, harder-to-conceal adjustable sights, might as well go to the THREE-INCH barreled guns with their full-length ejector rods...just my two cents' worth....mikey357