Weight is your friend, but not to sure in a Glock. It can get tricky on reliability when to much weight is added. The frame was designed to have some flex in it. That being said, I even tried the steel frame years ago, but it was a waist of money, because it would not run at all. May have been just a bad design. We have ran the whole circle over the years in our competition guns. Weight is good and it is simple physics to minimize the movement. I have the brass magwell and a heavy guide rod. Wish there were better options.