CMC Triggers AR-15/AR-10 Mid Length Gas Tube - The Nitride Coated Gas Tube is an essential component for the AR-15 family of firearms. Precision machined from 304 Stainless Steel, CMC Triggers AR15/AR10 gas tubes have an extremely durable Nitride finish that increases corrosion resistance, wear resistance, fatigue strength and cosmetic appeal while ensuring consistent gas flow to help your rifle cycle properly. This gas tube includes the gas tube roll pin. Mid Length Gas Tube 11.75in 304 Stainless Nitride Coated 100% Lifetime Warranty