One important point I don't think anyone has mentioned yet is that GBBs don't work well, if at all, in the cold. Once the temperature starts dropping the gas in your magazine condenses and becomes far less efficient. Often times GBBs will seize open in the cold, venting all of your gas on the first shot. Sometimes you'll manage to fire off a magazine but your velocity will be reduced to probably around springer range, depending on just how cold it is.
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