Two things to think about: the carbine was not designed to be a front line infantry weapon, it was pushed into that roll (remember the Garandwas not intended to be a .30 weapon).
The second thing: my uncle USMC was a Chosen survivor, he told me with the cold they had sleep with their grenades inside their over coats for them to function, the same thing is repeated several times In "The Last Stand of Fox Company" the rear guard of the withdrawal from the Chosen Valley. Nothing worked well in the extreme cold, men were able to fight on after being wounded because the cold aided the blood clotting.
Let us just hope that we are not pressed to test any of our Milsurps in combat.