So I finally pulled the trigger on a Mossberg 500 last weekend and I'm already down a rabbit hole. The gun feels great out of the box, no complaints but I can tell it's just the starting point. First thing I noticed is the stock feels a little generic, it is not bad, just kind of there. I am already eyeing a recoil pad and also thinking about an extended mag tube but I don't want to go crazy before I even know what I want this thing to do long-term. So for you guys who've had yours a while, what was the first thing you actually changed?