White Label Armory Castle Nut AR-10/AR-15 Steel Black Phosphate 5-Pack

White Label Armory castle nut designed for AR-10 and AR-15 platforms. Made from durable steel construction with a black phosphate finish for corrosion resistance. Essential component for securing buffer tube assemblies. Compatible with both AR-10 and AR-15 rifle systems. Sold as a 5-pack for multiple builds or replacement needs.