The addition to the Green Mountain line are these Ruger 10/22 Replacement Barrels. The alloy barrels are made from 4140 chrome molly while the stainless barrels are constructed of 416 stainless. Every Green Mountain 10/22 barrel goes through rigorous inspection to assure you of unmatched quality. A Bentz semi-auto match chamber is used for enhanced quality. The .920 heavy Green Mountain 10/22 rifle barrel is offered in blued or stainless steel and plain or fluted.