I loved the Classic Weapons are exclusive to the Mystery Box with Ultra Rarity, but I wish we could have the option to customize them with attachments and other customization items when you get them from Mystery Box (Image from Warzone, for illustrative the post).

I really liked it, mainly because it added even more value to the Mystery Box and the satisfaction factor after obtaining it, but I wish it were possible to customize the MP40 and future classic weapons that will be added, and when you take them out from the Mystery Box, are come with the customization done by the player, with attachments and other customization items (such as camouflages, weapon charms, etc.). And this isn't a problem since the attachments are already available in BO6, so basically it would only be necessary to create a new menu within the "Zombies Skins" menu dedicated to classic weapons and the possibility of customizing them.