To answer the original question. I used my gbb last winter with success, although the games I was at it didn't reach more than -2. I made sure to warm up my mag in my armpit after fillling, and didn't fire off 20 shots in a row. It obviously won't perform like in the middle of summer, but it was adequate for a back-up in a pinch.
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The Shepherd always finds His sheep.
The Flat Earth has me Levelled.
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