Add ImageThe XM4 is the first Arm Slave ever created. Developed under the Reagan administration's Strategic Defense Initiative. It was effective in urban combat and ambushes. Its use as a utility platform encouraged the further development of Arm Slaves. Retrieved from "https://fullmetalpanic.fandom.com/wiki/XM4?oldid=9734" Categories: Arm Slaves Community content is available under CC-BY-SA unless otherwise noted.