The White Label Armory AR15/AR10 Castle Nut 5-Pack offers rugged, mil-spec performance for securing your buffer tube assembly. Precision-machined from steel and phosphate coated for added corrosion resistance, these castle nuts ensure a reliable, tight fit on all standard carbine buffer tubes. Each nut is properly notched for staking to maintain alignment during use. Proudly made in the USA, this 5-pack is ideal for builders looking for durability and consistency across multiple AR15 or AR10 platforms.