Hi Brett, many are running into this very issue. As you have learned, clamps won't give you the tightness to be effective. Options are virtually non existent at the moment. Supposedly Crimson Trace is working on a "Grip Laser" last I heard. How S&W did not put a bottom rail on this beast is beyond me. You can contact S&W's Performance Division to see if they have any suggestions at (USA) 1-800-331-0852 Mon-Fri 8:00AM-6:00PM Eastern Time or by email inquiry here : smith-wesson.com/customer-service/contact-us

I am not aware of anything on the market to do this that would look ok and handle the recoil... as you have experienced. A machinist could likely adapt a piece to clamp around the barrel that would fit snug enough to handle the recoil but it might still not be aesthetically pleasing. Unfortunately the k frame laser grips don't seem to fit either due to the keyway size. Best of luck and enjoy your hand cannon (love my 4" and 7.5"pc).