The Nitride Coated Gas Tube is an essential component for the AR-15 family of firearms. CMC Triggers Nitride Stainless Steel AR15 / AR10 Gas Tubes Gas Tubes resists heat and corrosion. Ensures consistent gas flow to help your rifle cycle properly.Optimal usage includes building a new rifle or upgrading your existing rifles gas tube.FEATURESAvailable in Rifle length, Intermediate length,Mid length, Carbine length, and Pistol lengthIncludes Gas Tube Roll PinStainless steelBlack nitride finish100% Manufacturers Lifetime Warranty