Chi-town you make me proud, I called my service mgr this morning and telling him your story and I also have the rim problems, fog lts etc...and I asked why this wasn't taken care of when I had it in for the sensor problem....he told me to bring it in, this is why I haven't done any of my installs....I may have to call you....but I have my own AR15A2...I think my derringer will work on him though...