The AR-15 Billet Castle Nut features precision machined construction with a distinctive burnt OD green finish for enhanced durability and tactical aesthetics.AR-15 Billet Castle NutBurnt olive drab green anodized finishPrecision machined from billet aluminumStandard AR-15/M4 platform compatibilitySecures buffer tube to lower receiverEssential component for AR-15 builds and upgrades providing reliable buffer tube retention with a unique burnt OD green finish that complements tactical rifle configurations.