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Gamma Case
Here are all the skins from the Gamma Case.
Gamma
Case

Gamma Case
The Gamma Case is a weapon case introduced in the June 15, 2016 update, featuring community-created weapons and new knife finishes. Opening it requires a Gamma Case Key.
Here are all the skins that you can obtain from this case:

List of all Skins from the Gamma Case:
M4A1-S | Mecha Industries
Glock-18 | Wasteland Rebel
M4A4 | Desolate Space
P2000 | Imperial Dragon
SCAR-20 | Bloodsport
AWP | Phobos
R8 Revolver | Reboot
AUG | Aristocrat
P90 | Chopper
Sawed-Off | Limelight
Tec-9 | Ice Cap
SG 553 | Aerial
MAC-10 | Carnivore
Nova | Exo
P250 | Iron Clad
PP-Bizon | Harvester
M4A1-S Mecha Industries
M4A1-S | Mecha Industries (Field-Tested)

Starting at
$25.78
-26%
Glock-18 Wasteland Rebel
Glock-18 | Wasteland Rebel (Factory New)

Starting at
$6.48
-16%
M4A4 Desolate Space
M4A4 | Desolate Space (Field-Tested)

Starting at
$7.37
-21%
P2000 Imperial Dragon
P2000 | Imperial Dragon (Minimal Wear)

Starting at
$4.63
-21%
SCAR-20 Bloodsport
SCAR-20 | Bloodsport (Factory New)

Starting at
$11.98
-7%
AWP Phobos
AWP | Phobos (Minimal Wear)

Starting at
$1.50
-27%
R8 Revolver Reboot
R8 Revolver | Reboot (Minimal Wear)

Starting at
$0.99
-32%
AUG Aristocrat
AUG | Aristocrat (Minimal Wear)

Starting at
$1.15
-22%
P90 Chopper
P90 | Chopper (Factory New)

Starting at
$2.18
-24%
Sawed-Off Limelight
Sawed-Off | Limelight (Factory New)

Starting at
$2.20
-30%
Tec-9 Ice Cap
Tec-9 | Ice Cap (Factory New)

Starting at
$0.77
-22%
SG 553 Aerial
SG 553 | Aerial (Factory New)

Starting at
$0.32
-27%
MAC-10 Carnivore
MAC-10 | Carnivore (Factory New)

Starting at
$0.90
-1%
Nova Exo
Nova | Exo (Minimal Wear)

Starting at
$0.26
-16%
P250 Iron Clad
P250 | Iron Clad (Minimal Wear)

Starting at
$0.18
-28%
PP-Bizon Harvester
PP-Bizon | Harvester (Minimal Wear)

Starting at
$0.18
-25%
Previous Case: Chroma 2 Case