Extreme cold is merciless on machinery. Fluids thicken to useless goo. Rubber seals stiffen and crack. The problems pile up as the temperature falls. Metal becomes brittle, and wires contract.

Alternatively, for those interested in customization or perhaps a more hands-on approach, all of the parts required to assemble the AR4 can be 3D printed. This versatility makes the AR4 an excellent ...