Once you unlock the "Uberkommandant" mission on Eva's Hammer, select a district on the map and collect the weapon upgrade kit. Then, return to Eva's Hammer to collect it again. You can keep collecting the weapon upgrade from the same mission since it resets each time. Repeat this as many times as desired. Note: This glitch was performed on an unpatched version of the game. It may eventually get patched. To avoid not being able to use this exploit, either do not install new patches before using this exploit or delete the patches. You can avoid patches being installed by disconnecting from the internet until you are ready for the game to install new patches.