WMD Guns Mid-Length Gas Tube Features The WMD Guns Mid-Length Gas Tube is crafted from Mil Spec 304 stainless steel which means it resists the corrosion that carbon steel tubes are prone to under repeated heat cycling. The Nitromet process used to finish the tube is a salt bath nitrocarburizing treatment that produces a surface hardness of Rc 55 giving it added durability over an uncoated tube. This finish also results in the rich matte black color that matches other Nitromet treated AR components for a uniform look. At 11 3/4 inches the tube is sized specifically for mid-length gas systems directing gas from the port back to the bolt carrier with consistent timing. Installation is straightforward since the tube is designed as a direct fit for AR-15 and AR-308 universal platforms and it ships complete with the roll pin needed for assembly. Builders replacing a damaged or discolored factory tube will appreciate that this component drops into place without additional machining. The added heat and corrosion resistance from the Nitromet finish means the tube is likely to maintain reliable function and appearance over a long service life. For anyone building or refreshing a mid-length AR upper this gas tube is a dependable mil spec component. WMD Guns Mid-Length Gas Tube Specifications Manufacturer: WMD Guns Model: Mid-Length Gas Tube Compatible Hosts: AR-15 AR-308 Color: Black Material: Stainless Steel Finish: Nitromet Length: 11.75 Gas System Length: Mid-Length Available At: GrabAGun