Valid point. However I do have technical drawings of the FCG and a Water Jet Table, so worst comes to worst, I will just make one from a piece of sheet steel.
I have a 320 Full Size with the compact slim grip and a Surefire x300 on it... Absolutely love it. However... I would rather have the same setup with the Manual Safety. Will probably just get a new 80% fcg and finish it out as a model with the safety.