Technology & Combat Characteristics
Originally planned by the Earth Alliance to be Mu La Flaga's personal unit, the Gunbarrel Strike mounts the AQM/E-X04 Gunbarrel Striker as a Striker Pack, allowing the suit usage of four Wired Gunbarrels (which could only be controlled by individuals with high spatial awareness, like Mu) and perhaps the Striker's Gatling Gun. The Gunbarrel Strike is also armed with its standard beam rifle and shield, but lacks a beam saber to engage in close combat.
History
While the Strike never uses the Gunbarrel Striker due to Mu's defection from the Earth Alliance in Mobile Suit Gundam SEED, it is possible to alter the events in Tomo to kimi to Koko de and have Mu use the Gunbarrel Strike during the Battle of Mendel and afterward. This can be achieved by having Kira Yamato work on the MBF-M1 Astray's OS without looking for Birdy. This makes Kira complete the OS faster than he does in the anime, resulting in Erica Simmons giving a spare M1 Astray to the Archangel to replace Mu's FX-550 Skygrasper. Should Kira visit the MS hangar after the battle at Orb, he will find Mu happily talking about how he is now getting used to piloting MS, although he feels bad for his now obsolete Moebius Zero. Overhearing this, Erica offers to modify the TS-MA2mod.00 Moebius Zero into a new custom Striker Pack.