It’s not so much a change as a I finally got around to updating the shielding rule to what it was actually changed to before last AU/NZ nats.
Please go here to see the update. It essentially moves part C of the rule (which was the show a shoulder part) into part A. It’s not functionally different than before for the US version – for the AU/NZ version it added referencing to the chest sensor since AU/NZ does not consider the front of the gun to be a visible hit zone due to IR issues.
