The weapon level in Call of Duty Online was determined by the weapon's rarity and damage value. The rarer the weapon, the higher the damage value, but the more EXP it required to level up. Generally speaking, weapons were divided into levels 1-10. Level 1-2 weapons were more common, level 3-5 weapons were rarer, and level 6-8 weapons were more precious. Leveling up a weapon required in-game coins or experience points, and different levels of weapons required different experience points. During the leveling process, the weapon's level would also increase with the increase of experience points. When the weapon reaches level 10, its level will remain the same, but its damage and attack speed will increase. At the same time, upgrading a weapon would also increase its durability, making it more durable in use. The level of a weapon was a very important element in the game. Different levels of weapons could provide better performance and more skills, so players needed to constantly collect and upgrade weapons in the game.