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You can not trade Garry's Mod. It is already in your game library. It's part of your account and can't be given to anybody else. You can onky trade redemption cd-keys, Humble Bundle gift links, and tradable Steam Inventory Gifts.
You're not listening.
You LITERALLY can not trade your Garry's Mod. It is stuck to your Steam library. It's NOT tradable.
Garrys Mod
Space Engineers,gang beast
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