UPgrading items will upgrade to the max GS in that World Tier
EDIT: Control point officers now actually wear armor and have the ability to revive.
EDIT: Lowered accuracy of nade throwers.
CLARIFICATION (please correct me if wrong): The "Upgrading" portion of this comment when I wrote it was tied to Exotics and when you upgrade them, they'll be automatically the max Gearscore of that World Tier. This is in response to before where an exotic would be upgraded and be significantly UNDER the max gearscore/stats/dmg of that current World Tier even so far as being a downgrade from its previous state.