A walking ammo chest... for its allies. Fully restores the ammo of all nearby allies each time it acts.
Virused AmmoBots will refill your exo's ammo. As of version 1.011 they only refill one point of ammo per weapon per turn, and take 50% damage when doing so (for a maximum of two refills). However, they are also much cheaper to virus (2x multiplier, from 5x).