Trade-Up

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If you've got ten campaign-exclusive items just sitting around, we've got good news for you. Now you can trade them in for a higher-tier item! Simply click on any Gun Mettle item in your inventory and choose "Mann Co. Trade-Up" from the drop-down menu to give it a shot!

— TF2 Official Blog

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Trade-Up is a feature that allows players to upgrade the grade of their Decorated weapons or Invasion items. It is accessible from a sub-menu via the backpack.

Inputs

Trade-Up requires ten weapons or cosmetics of the same grade. Decorated weapons are obtainable through completing campaign contracts, or by opening a weapon case obtained from completing campaign contracts. Invasion items can be obtained by opening the related Community Crates. Weapons may be of any wear, but must all be of the same grade (Civilian, Freelance, Mercenary, etc.). Stat-Clock Decorated weapons may also be accepted, although Unusual Decorated weapons are prohibited.

Output

After confirming the input of the required number of items, the player receives one item of the next higher grade. For example, if ten Civilian Decorated weapons were submitted, one Freelance Decorated weapon is received; ten Mercenary Decorated weapons yields one Commando Decorated weapon, and so on. If all submitted items were Strange, then the output is also Strange.

The resulting item is selected at random from one of the same collection(s) as the originating items. For example, if ten weapons from the Teufort Collection were submitted, the result will also be from the Teufort Collection. If items from multiple collections are used, then the item received can be from one of those collections as well.

The wear of the received weapon is calculated based on the average wear of all submitted weapons. Therefore, inputting ten Battle-Scarred Civilian Grade Decorated weapons will result in one Battle-Scarred Freelance Grade Decorated weapon; however, if ten Factory New Commando Grade Decorated weapons are used, then the result will be a Factory New Assassin Grade Decorated weapon.