I like the functionality of the Kimber extended mag for the Solo, but consider it to be less than aesthetically pleasing. A search of the internet for mag extensions resulted in zero findings. So I purchased a PG-MK9: KAHR grip extension from Pearce Grips thinking it was the closest fit and went to work. Two holes, threaded, with SS screws resulted as follows. Not my best work, but it was fun. Perhaps Pearce will provide a proper mag extension for the Solo in the future. I believe it would help those folks with a tendency to "limp wrist" the Solo's extensive recoil to reduce stove pipes and FTF's.