Solid metal gear

Description
Upgrade a weapon to level 5


 * Missable.
 * You can upgrade a weapon in workbench, which refer to Crafting.
 * You do not need upgrade a weapon from level 1 to level 5, which means in order to earn this trophy, just upgrade a level 4 weapon to level 5 is enough. (Save lots of component, right?)
 * You can combine this trophy with Work in progress.