You can find the Spike's Tactical Mid Length Melonited Gas Tube here Fast $9.95 shipping! Orders over $200 ship for free!
Spike's Tactical Mid Length Melonited Gas Tube for AR-15 is made out of Mil-Spec 304 stainless steel and then Melonite coated for greater heat and corrosion resistance as well as lower light reflection. Includes roll pin.