The Infinity 556K features a Haynes 282 superalloy construction that provides prolonged extreme temperature resistance and utilizes a unique adjustable end cap system that allows for users to adjust the amount of back pressure. This system makes the Infinity an ideal candidate multi-platform use, letting users go from bolt-action guns to over-gassed duty rifles while maintaining optimum performance. This model features an all-black finish and is compatible with the Universal HUB adapter system. Included a medium back pressure end cap.