My favourite 9 mm pistols are the CZ and the Sig. In Western Canada (not the coast) polymer pistols are not the cat's meow at 30 below. Plastic doesn't like extreme cold. I have also found that aluminium framed pistols sometimes don't work at extreme cold due to the difference in thermal contraction rates between steel and aluminium.

"I make plastic pistols for plastic soldiers". Gaston Glock.