As sick as it might sound, took the AR out this morning at -19 after making sure all the oil was wiped out of bolt assembly, charging handle, and trigger assembly. I left the gun out for about an hour and then shot it. I had multiple malfuntions which cleared easily and had one jam that required going back inside to clear the empty brass. I then lubed up all the moving parts again with Tetra oil then set the rifle back outside for an hour. Then I ran through two twenty rounds magazines without proplems. Something to do on a cold day.