FUSION
Fusion is a unique feature where players can combine weapons to create a better or new weapon. Fusion is important for all players as it allows them to obtain powerful weapons without the Restricted Weapon Crate, which gives random weapons.
POWER UP
Power Up is the only place to level up a weapon to increase its stats until it reaches its maximum level. This is the first process of getting the weapon to its maximum level so it is able to be used in Evolve and Combine. Other than that, it can be used to trash unwanted weapons.
EVOLVE
Once you have a fully leveled up a weapon, you are able to evolve it in this section. Evolve is a section where you can increase its star value (Rank), and also to increase a particular stat (e.g. Larger magazines are seen to increase ammo capacity). However, you are required to have one of the same weapon of equal rank. You are also required to have a number of weapons equal to the weapon's rank, and the number depends on the rank of your weapon (e.g. 3 star weapons requires three 3 star weapons).
COMBINE
Combine is an alternative way of getting a higher-ranked weapon. Unlike Evolving, combining does not require one of the same weapon, and the result of combining weapons is a random weapon of a higher rank.
WEAPONS UPGRADE CHART
Here is a weapons upgrade chart that's based purely on 1 star upgrades. (Thanks to WilsonK for making this chart)
TIPS
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Use the Military Weapons Crate for cheap and efficient fusion materials.
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Do not use unwanted weapons of a very high rank for powering up (Especially after an unlucky weapon drop from the Restricted Weapons Crate), as they are useful for later evolving or combining of weapon.
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When trying to evolve 4 star or better weapons, try to evolve 3 star weapons so you don't have to waste gold on the Restricted Weapons Crate.
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Never combine your most preferred or most reliable weapons since you have a higher chance of getting unfavorable weapons (e.g. 4 star CQB Charlie into a 5 star Far N). Use unwanted weapons for a chance to get better weapons.
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Use 3 star weapons from Military Weapons Crate as power up materials to get higher levels faster.