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You'll obviously want something that doesn't break down every other time you take it out, and FYI most GBBR's are highly prone to the cold due to being (typically) propane powered.
The KJW M4 is renowned as the most reliable base, also works pretty well through a variety of temperatures.
And the WE 'open bolt' series is also highly reliable, with the advantage that you can buy CO2 mags for it that work much better in cold temps
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