Get one of the best semi auto rifles used in American history by ordering the Colt Firearms Model XM16E1. Designed with the gas operation semi auto system, this long range rifle features a 20 inch barrel, 20 round magazine for 5.56, a safety selector, and a three prong flash hider. Designed to take a beating, this rifle is not what is traditionally seen in hunting rifles and is often more so used on Colt Firearms Model XM16E1