Looks like there is a way to store weapons in Outbreak after all. Seems that Exo Zombies is very very similar to Treyarch's zombie mode. Appose to just "similar". Anyways, you can get an upgraded gun and store it in the box by simply buying another gun from the box or 3d printer and swapping out the upgraded gun for the new gun. Pretty simple. Only thing at the moment is no one knows if this can transfer to another game or not. But certainly it has its benefits for a particular game, as the video below describes.

If you decide to test this out and find out something new, such as transferring the upgrade to another game then please post below to notify everyone of your findings.

Click this link for the YouTube video: [ Register or Signin to view external links. ]