The Sons Of Liberty Gun Works Pistol Gas Tube is engineered for reliable AR-15 builds with black nitride QPQ treatment for superior durability and corrosion resistance.Sons Of Liberty Gun Works Pistol-Length Gas TubeDesigned specifically for AR-15 platformsQPQ (black nitride) treated finishCorrosion resistant coatingIncludes roll pin for installationFits most mil-spec firearmsPerfect for your next AR-15 build competition setup or defensive configuration. Sons of Liberty Gun Works delivers quality components trusted by builders and shooters.