MRA Black Nitride Steel Gas Tube MRA Black Nitride Steel Gas Tube are constructed of US Mil – Spec 304 Stainless Steel then Black Nitride treated and are offered in a variety of lengths to suit your specific application. Specifications 6.75 ” Pistol Length 9. 75 ” Carbine Length 11. 75 ” Mid – Length 15.125 ” Rifle Length Click here to see all our Rifle Parts
