So, I'm completely new to this sort of this, and just received a midnight Geo 3.1 in this year's package. This gun DESPERATELY needs some color to it, and I've heard from a few people that anodizing can potentially ruin the body of the gun. Is this true in any way?
Anodizing won't ruin the gun. The gun comes from factory anodized. When you have it redone all the anodizer does is strip off the existing anno layer and apply a new one and dye it different colors/patterns. The only risk is if the anodizer strips too long. The stripper dissolves the previous layer but if done wrong, will continue to dissolve the aluminum underneath. This will affect tolerances that will usually not be able to be restored by applying a thicker layer when anno'd.
Long story short. Re-anodizing won't hurt anything, unless it's done wrong. Go with a reputable company and you'll be fine.