I recently ordered a new leather holster for my Speed Six. I was told by the manufacturer that he could use a mold for a GP 100 and it would fit fine, as the frames were the same. I wondered if that were true at the time. It is certainly not as tight of a fit as I was expecting. Overall, I will still use the holster, but would not have purchased it had I known it would be this loose. It fits fine around the barrel and trigger, but has a 1/8" gap all the way around the cylinder.