When powered, it can be used to research weapon and armor upgrades for Marines and Exosuits. If the Arms Lab gets destroyed while an upgrade is researching, the research gets aborted and the research costs are lost.
Note: You can't recycle the Arms Lab while researching an upgrade. Instead, you have to cancel the research first, then you can recycle the structure.
Weapon Upgrades are damage upgrades researched by the Marine Commander from an Arms Lab. Each level increases damage of certain weapons by 10% and costs more Team Resources and time to research. Weapon Upgrades affect the following weapons: Assault Rifle, Shotgun, Machine Gun, Pistol, Switch-Axe and Exosuit Minigun and Railgun.
Armor Upgrades are a defensive upgrade researched by the Marine Commander from an Arms Lab. Each level increases Marine armor by 20 points and Exosuit armor by 45 points, as well as costs more Team Resources and time to research.