A variant of the Rick Dom that had its generator enhanced for the testing of mobile suit-portable beam weapons. It was armed with a "beam bazooka", an experimental high-powered beam cannon originally used by mobile armors. Due to issues with the cooling system, the beam bazooka was impossible to mass produce and only assigned to a small number of veteran pilots.
After Char Aznable pursued the newly formed 13th Autonomous Corps into space, he received a MS-09RS Rick Dom, painted in his colors. Piloting the mobile suit, he undertook a mock battle with four MS-06F Zaku II. After defeating all four Zakus, he noted that while the Rick Dom's mobility was impressive, its maneuverability was lacking, placing it as a disadvantage during close combat. He doubted that the Rick Dom would allow him to defeat the RX-78-2 Gundam.