Being an "EX" carpenter from northern MN we would often work in -30 to -40 weather and at those temps driving hardened nails (concrete nails) we would experience metal chipping off the face of the hammer, it never happened in warmer weather. Also welds would break much easier on the snow removal equipment when it got down in that temp range.

It wasn't too long ago that one of the rifle manufacturers had a problem with barrels splitting in extreme cold, can't remember the details though.

After the first shot the rest are just noise.