This AR-15 Billet Castle Nut features precision machining from billet aluminum with a durable Burnt Flat Dark Earth finish for enhanced corrosion resistance and tactical aesthetics.AR-15 Billet Castle NutBurnt Flat Dark Earth finishPrecision machined from billet aluminumCompatible with AR-15 platform riflesDurable construction for reliable performanceEssential component for AR-15 builds and upgrades providing secure buffer tube retention with a professional tactical finish that matches FDE accessories and furniture.