Billet AR-15 Lower Receiver Constructed From Advanced 2055 Lithium/aluminum Type III Hardcoat Anodize Weighs 6.4 Oz Ships With Qd Endplate (7075 T6) Advanced 2055 Lithium Aluminum Alloy Is Lighter, Stronger, More Rigid & Corrosion Resistant Than Standard 7075 T6 Mil Spec Compatible Made In The USA