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The Snowstorm Gunskin was obtainable in Season 1: "New Beginnings" by reaching level 3.
Supply is widely distributed — no single holder owns enough to register as a hoarder.
Snowstorm Gunskin is an extremely rare item to come by, with a very little MU count of ~66 (which is more than the other extremely rare items), as well as it being a heavily stacked item by traders, its extremely difficult to spot one in trading.