The White Label Armory WLA-PAC-7004-05 Castle Nut provides reliable buffer tube securing for AR10 and AR15 platform builds with durable steel construction and phosphate finish.White Label Armory WLA-PAC-7004-05 Castle NutSteel construction for maximum durabilityPhosphate finish for corrosion resistanceCompatible with AR10 and AR15 platforms5-pack quantity for multiple builds or replacementsEssential component for securing buffer tube assemblies in AR-platform rifle builds offering reliable performance for builders and gunsmiths.