Won't happen. I bought a model 69 with thoughts of a 45 conversion. But, the chamber walls would be way to thin. I know CA and Taurus have done small 45s, but, they have a smaller ratchet and their chambers are closer to the center. For S&W to do a L frame 45 they would have to shrink the ratchet, move the chambers in relocate the hand and its slot to operate it. Then move the barrel down in the frame. Not going to happen. They could make the cylinder and frame opening bigger, but then your basically have an N frame.