Add to Cart Compare LBE AR Castle NUT LBE Unlimited MSRP: $8.99 Now: $5.22 Was: LBE Unlimited Castle Nut, For AR-15, Manganese Phosphate Coated 4140 Steel ARCNUTSpecificationsFinish/Color:Manganese Phosphate Coated 4140 SteelModel:Castle NutModel2:AR15Type:Castle Nut MSRP: $8.99 Now: $5.22 Was: Add to Cart Compare