Guntec AR9 Upper Receiver Features The Guntec USA AR9 Upper Receiver is manufactured from a solid block of 6061 T6 billet aluminum rather than a forging giving the receiver tight tolerances and a clean uniform finish throughout. The smooth slab side design strips away the forged lines typically seen on mil-spec uppers for a distinct billet look that many builders prefer for a custom 9mm project. A flat top profile with a 1913 Picatinny rail runs the length of the receiver providing a continuous mounting surface for red dots magnifiers or conventional scopes. Because it is built specifically for 9mm Luger this upper is matched to AR9 bolt carrier groups and barrels rather than standard 5.56 components. This stripped upper is designed to match any brand of AR-15 pattern lower receiver so builders are not locked into a single manufacturer when completing their build. The black anodized finish provides a durable corrosion-resistant surface that stands up to regular handling and range use. Made in the USA it reflects the quality control and material standards builders expect from a domestically produced billet receiver. For anyone assembling a dedicated 9mm AR platform from the ground up this upper receiver is a solid accessory-ready starting point for sale at GrabAGun. Guntec AR9 Upper Receiver Specifications Manufacturer: GunTec Model: AR9 Upper Receiver Type: Stripped Billet Upper Receiver Caliber: 9mm Luger Material: 6061 T6 Billet Aluminum Finish: Anodized Black Top Rail: Flat Top 1913 Picatinny Country of Origin: Made in the USA Available At: GrabAGun