Three weeks since America's deadliest high school shooting, companies such as Delta Air Lines, and Dick Sporting Goods have announced that they have cut ties with gun-rights groups restricted sales of weapons. On Wednesday, plan administrators told Reuters that investors trying to send an anti-gun message are facing challenges, as a number of U.S. mutual fund companies show little desire to move away from index funds that carry fire-arms. Most U.S. funds with holdings in gun companies have shown little indication they would change their investment models to exclude firearms companies.