Over the years I've owned two M-19s, a 2 1/2 and a 6", and two 66s, another 2 1/2 and a 4". Of these, only the 4" 66 remains, but I'm not planning to part with it anytime soon. It's one of the 66-7s with the hated/dreaded lock, but I believe that's the last 66 S&W made before discontinuing all K-frames. My guess is that there'll be special runs at some point in the future, but who knows? I use the 4" in IDPA competition and it's a great gun. I found the 2 1/2" too big for CCW use, and too short for field or competition use. Still, they are nice guns, all of them, and I hate to see them discontinued.