Both the FN FAL and Lee Enfield work in severe cold weather very reliably! I normally use a dry graphite on my guns during the winter months. The Lee Enfield is still issued to the Canadian Rangers(Eskimos) way up north as a standard issue rifle. I think the action covers for the Enfield last seen service during WW II. I've had good luck with Bushnell scopes during the winter. They have a great warranty service also.