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. FEATURES Available in Rifle length, Intermediate length, Mid length, Carbine length, and Pistol length Includes Gas Tube Roll Pin Stainless steel Black nitride finish 100% Manufacturers Lifetime Warranty