The AR-STONER Stripped AR-15 Sporter Billet Upper Receiver is a great choice for your next AR-15 Build. Machined from 6061-T6 aluminum, this durable upper receiver will perform in any environment. Featuring a sleek, aesthetically pleasing profile, this A3 flat top is ready for further customization with your choice of an optic, or front and rear sights. The AR-STONER Sporter Upper Receiver is pre-drilled to accept, a 1/8" x 3/8" alignment pin. Although the alignment pin is not required for installation of this universal upper receiver, a near seamless fit can be achieved when paired with an AR-STONER V2 Free Float Handguard (family #1020691635) - which comes pre-drilled to accept, and includes, the V2 handguard alignment pin. Once assembled, this upper fits precisely onto any standard lower receiver. Give your next AR-15 great looks and function with the AR-STONER Stripped AR-15 Sporter Billet Upper Receiver.FeaturesMachined From Solid 6061-T6 AluminumType III Anod...