Well, I did it. I order the tugsten guide rod and a 15# ISMI spring along with the adaptor for my G35 Gen4. It does make a noticeable difference with the stock spring system and I like it a lot. My glock with the brass magwell and tugsten rod have more of the feel of a all steel gun like a 1911 and the balance is very nice. Now I have to do my homework and practice, practice, practice...