I have one installed on my Colt CCO. Shooting 230gr plus P ammo in an aluminum frame gun, I figure I needed the best protection from frame cracking, and I think the Cominolli is the best for this application. I was going to make a post on this myself, but just like usual, I procrastinated untill someone else posted it first. :smile: The buffs needed to be trimed so the slide does not drag on them. If you are willing to put up with the hassle of a full length guiderod, I thing it's a great idea. But, just like any other aftermarket gadget, it needs maintainance, so the buffs should be checked often, if you shoot a lot.