Well, I have been playing the game, not worrying much about it figuring I would just get it when I got it. Then a friend told me you get it after the mission where you find the sniper from the first game(not gonna butcher the spelling of his name, LOL) and you find sanctuary again, and I am now at the part where you need to disable angel. Yet I still don't have the fourth weapon slot. What happened?
https://www.youtube.com/user/gamelerp85?feature=mhee My youtube. I just started it, but am making gameplay vids. Nothing special. Check it out.