Will we still be able to use them in custom zombies? This is something that has been bugging me since the mod tools alpha started. The reason I am asking is at i did the grind of getting every weapon in zombies to its maximum level, and I know so e map makers li!e to make really challenging maps so a attachment like fast being able to be used early on is a blessing.

Yes, most likely, unless they remove the feature or split progression to avoid people modding their weapons up. It's already been shown in the videos people have released that they do have their own attachments on guns. I haven't seen paint jobs actually, but I have definitely seen attachments.