Guntec USA AR-15 9mm Dedicated Stripped Billet Upper Receiver Rainbow. The goal is to distribute excellent quality at an economical value. Specifications for Guntec USA AR-15 9mm Dedicated Stripped Billet Upper Receiver: Manufacturer: Guntec USA Finish: Anodized Caliber: 9mm Luger Gun Make: AR Platform Gun Model: AR-15 Condition: New Features of Guntec USA AR-15 9mm Dedicated Stripped Billet Upper Receiver 1913 Picatinny rail flat top. Smooth Slab Side design Will match up with any brand 9mm Lower Receiver such as new Frontier Palmetto State Armory etc. Package Contents: Guntec USA AR-15 9mm Dedicated Stripped Billet Upper Receiver What firearm models does the manufacturer say Guntec USA AR-15 9mm Dedicated Stripped Billet Upper Receiver is compatible with? The manufacturer says that Guntec USA AR-15 9mm Dedicated Stripped Billet Upper Receiver is compatible with AR-15Guntec USA GT-UPPER-9-RPVD: AR-15 9mm Dedicated Stripped Billet Upper Receiver Rainbow