Brigand Arms AR-15 Barrel Nut. Purchase includes one barrel nut and one collar Barrel Nut is machined from high-strength 7075 Aluminum then hard coat anodized black. Lab-tested for durability accurately turned threads and precisely drilled ports provide strength and reliability at low weight. The external threads are the standard Yankee Hill pattern which works with many manufacturers not just Brigand Arms NOAX and Black series. Specifications for Brigand Arms AR-10/AR-15 Replacement Barrel Nut: Manufacturer: Brigand Arms Color: Black Condition: New Package Contents: Brigand Arms AR-10/AR-15 Replacement Barrel Nut What firearm models does the manufacturer say Brigand Arms AR-10/AR-15 Replacement Barrel Nut is compatible with? The manufacturer suggests that Brigand Arms AR-10/AR-15 Replacement Barrel Nut is compatible with AR-15 AR-10Brigand Arms BN-223: AR-15 Barrel Nut