Besides the standard armament of the ZGMF-1000 ZAKU Warrior, the Gunner ZAKU Warrior also carries a single M1500 "Orthros" high-energy long-range beam cannon, which is mounted on the Gunner Wizard Pack. This beam cannon is the strongest optional armament of the ZAKU Warrior and grants it an impressive firepower over long ranges, capable of destroying a spaceship in a single shot. The only drawback of the weapon is the slow firing speed and recoiling.
One of the many variants of the ZAKU Warrior achieved through use of the Wizard Packs, the Gunner ZAKU Warrior is equipped for heavy firepower. One custom red-colored Gunner ZAKU was used by ZAFT red elite pilot Lunamaria Hawke, who is one of the pilots stationed aboard the new battleship Minerva. Luna and her suit were thrown early in serious battles, when three prototype Second Generation Gundams are stolen from the ZAFT colony Armory One by Earth Alliance special forces team Phantom Pain. As a result, Luna and her ZAKU fought several times against the stolen Gundams while persuing them to Earth. When the Minerva desended down to Earth and the Second Bloody Valentine War began, Luna' ZAKU was most times used as a fixed turret standing on board the Minerva while shooting down enemies. Her suit was eventually critically damaged during battle against a joint EA/Orb Union fleet, when Luna's ZAKU was hit several times by missiles fired from one of Orb's MVF-M11C Murasames. Luna herself was injured but recovered right in time to get her new suit, the ZGMF-X56S Impulse.
Former GAT-X103 Buster pilot and Joule squadron member Dearka Elsman also piloted a Gunner ZAKU Warrior during the "Break the World" incident while fighting rough Coordinators in their ZGMF-1017M2 GINN High Maneuver Type II. He eventually switched to a custom-colored ZGMF-1001/M Blaze ZAKU Phantom during the last weeks of the war. Several Gunner ZAKU Warriors with custom colored shoulder spikes were part of the Joule squardron while fighting to destroy one of the Requiem superweapon's relay stations.