The Bootleg Mid Length AR15 Gas Tube is engineered for reliable performance in your upper receiver assembly featuring stainless steel construction and a protective Salt Bath Nitriding (SBN) coating.Bootleg Mid Length AR15 Gas TubeStainless steel construction for maximum durabilitySalt Bath Nitriding (SBN) coating for uniform protection and corrosion resistanceMid-length specification for optimal cycling performanceCompatible with AR15 upper receiver assembliesEssential for gas system customization or replacement applications this gas tube delivers the quality and longevity that Bootleg Inc. is known for in long gun components.