Back in the day, when I was in my late teens and early 20's. A friend and I would go to the range in the dead of winter. As we would typically miss the short window of daylight, we would pull the car up between the benches at the range, and use the headlights to illuminate the target. we would sit or stand at the front of the car, with the headlights on either side of us. The temps would range from 0F to -30 to -40F. The guns would usually function well, but we used Arctic grade hydraulic oil for lube, and then only sparingly on the important friction points. We found at that time, late 70's or so, that most of the commercial "gun oils" would gel up at sub-zero temps. These days, many of the quality synthetic gun lubes on the market are good for low temps, and have operating ranges printed on the container.
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