Palumbo,
I'm just curious as to wear issues relating to the steel spring moving back and forth on the aluminum rod. I had a bad experience, albeit with a different make of pistol, with the metal of the guide rod not liking the metal of the spring interacting with it. It began to gall so frequently/severely that the weapon could no longer be counted on. I can see no such likelihood with the polymer rod, I'm just a little worried about the "head" of the guide rod detaching from the rod itself. (probably never happen...I know, but even LESS likely to happen with aluminum I'm thinking)