The gamma case was released in a regular update on June 15th, 2016. The case contains 17 community-designed weapon skins.
The gamma case is particularly attractive to the players, since it added 5 knife skins, together with new knife finishes. The container also includes other popular skins, such as Glock-18 Wasteland Rebel.
To open the case you will need a gamma case key in your Steam inventory. You can buy it in the store, or trade for it with other CS2(CS:GO) players on the Steam market. When you open the container, you have a chance to get one of the following skins:
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