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 CSGO 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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