To be specific, you can remove your rig with holstered firearm in a Safety Area, or as instructed by a RO.
IPSC Rule:
5.2.2 Handling – Except when within the boundaries of a Safety Area, or when under the supervision and direct command of a Range Officer, competitors must not handle their firearms. The word "handle" includes holstering or unholstering a firearm, even if it is concealed by a protective cover, and/or adding or removing it to/from the competitor's person while it is wholly or partially holstered. Violations are subject to Rule 10.5.1.