I'm pretty sure you can swap out the slide for a 3rd generation compact gun. I have a 669 and am planning on putting a 6906 slide on it, so I can get the white dot front sight. I also believe that Novak's does work on second gen. S&W autos. The Novak option is more expensive, but you can choose the exact sights you want. I don't have the funds for the Novak's, so I'm going the 6906 route.