It's often the little elements that get overlooked in an AR-15 build, and the gas tube is one of them. It could be said that this simple tube is the unsung hero of the AR platform, because without a solid gas tube, your semi-automatic functioning goes right out the window. That's why CMC Triggers put high-quality materials in its AR-15 Nitride Gas Tubes. Each CMC Triggers AR-15 Nitride Gas Tube is machined from 304 stainless steel and, as the name implies, is treated with a nitride finish that prevents corrosion and wear. Tubes are available in pistol, carbine, mid-length, intermediate and rifle lengths, and each tube is made right here in the USA.