The RGM-79HC GM Guard Custom is a mobile suit from Mobile Suit Gundam THE ORIGIN Mobile Suit Discovery.

The GM Guard Custom is a mobile suit with improved defense capabilities based on the RGM-79SC GM Sniper Custom. Its personal armament, the Guardian Shield, is composed of five layers of composite armor made of four different alloy materials. It is armed with a beam spray gun and beam daggers that produces a short blade, while a visor with a compound sensor is placed on the head. Despite having high performance, the suit is hard to control and passed to highly skilled pilots. The GM Guard Custom is primarily used for guarding the fleet and base defense, playing an active role in the latter stage of the One Year War.