Gases are what drive the AR system. This often overlooked but critical part of the system is easy to upgrade to its full potential, simply use a Seekins Precision Gas tube. Melonite coating is used to reduce wear and corrosion even during periods of extended fire. Fouling is also easier to clean from this non reflective coating than standard Parkerizing type finishes. The Seekins Precision Gas Tubes are available in rifle, mid-length, carbine and pistol lengths to accommodate any AR platform. *Roll pin included.