The Crafting System in BioMutant is used to make unique and better weapons for your character by using the resources found in the game world with millions of crafting combinations possible. To craft an item, simply head to a workbench located throughout the game world to begin.
Unlike armors, weapons are usually not found as whole items, instead weapon parts are found and you can use those to make your own weapons. There are 5 different parts to weapons but to make a melee weapon you will only need a minimum of a handle and base type to make a functioning weapon and for long range weapons (Guns) you will need a base type grip and muzzle.
Crafting Resources List
Craftable Items List