Just don't confuse the Compac and the Compac Pro. They are very different. The Compac is a recoil soaking up hand grasping wonderful hunk of rubber while the Pro is a skinny little thing that leaves the back of the grip frame exposed to hammer into your hand. It's like having a skinny magna with grip adapter all in one unit. I can do magnums in my 640 with the Compac while the Pro would be torture.