I don't think they do anything, but I don't feel the need to replace the one in my Springfield either. Both types work fine in my experience. My Colt shoots better than my Springfield but I doubt that has anything to do with the construction of the guide-rod.
__________________
"A human being is primarily a bag for putting food into; the other functions and faculties may be more godlike, but in point of time they come afterwards."
-George Orwell
|