
Weapons excluded from being used in the Trade Up Contract include: Although normal or StatTrak™ weapon skins can be used in the contract, they cannot be mixed together. Despite common belief, you cannot trade Red (Ancient) Covert weapons skins for knives. Unusable weapons will not have this context item.
#M4A1 NIGHTMARE TRADE UP SKIN#
As of the update, a context menu was added to the inventory screen which directly opens the skin in the Trade Up Contract. Not all weapons are eligible for the trade up contract.

The player has one last chance to cancel before clicking the final "Submit Contract" to trade. The player may sign anywhere and sign anything on the contract, as long as they use the mouse to click the contract at least once. To trade, the player will open the contract and select 10 available skins, after which a contract screen will open up, displaying a contract filled with the date, the player's name, rank, a randomized form number, a confirmation that 10 goods are selected for trade, and prompting the player to sign with their mouse and confirm the trade up. The trade up contract is an item accessed from the player's inventory and allows players to trade 10 normal or 10 StatTrak™ weapon skins of the same weapon grade from any collection for 1 new weapon skin of the next highest grade tier chosen randomly from one of the collections used.
