I own both the 6 7/8" flat sided barrel competetion model, and the KMK-512. I've stopped counting the rounds put through the latter. The difference in balance between the two is splitting hairs to me. The longer barrel on the competition model is compensated somewhat by the lighter flat sided barrel, and gives a longer sight radius. Nonetheless, I admit to having ever so slight a preference for the KMK-512. Neither will dissappoint you.