I have an Ultra too and am very anal about mags. I have found that the Kim-Pro Tac Mags are flawless. The factory mag has also been trouble free but the followers on the Tac Mags are superior. Ignore you friend, get some Tac Mags fro Cabelas, kimber or a ton of other sources. My three Wilson's all had problems with the base plates slipping off with daily pocket carry the Tac mags have not.