The AR-STONER(TM) Stripped AR-15 Billet Upper Receiver is a great choice for your next AR-15 Build. Carved from aluminum and hard coat anodized, this upper is durable and will perform consistently. Sharp lines give your rifle an aesthetically pleasing profile. The flat top A3 design is great for adding your own optics for further customization. Once assembled, this upper fits precisely onto any standard lower receiver. Give your next AR-15 great looks along with great function with the AR-STONER(TM) Stripped AR-15 Billet Upper Receiver. FeaturesMachined from a Solid Billet of 7075-T6Precise Drop-In FitModern Sleek Design