Uh ammo matters big time in izone. If you have ever been to a base you will be wandering around for quite a bit and a lot of the really spammy top tier guns like the chaingun do not become good due to the fact that it runs outta ammo fast. It burns through those 250 rounds very fast. If you run out of ammo on one gun in a planet and assaulting it can take a while to get ammo and go back to the front