All our uppers are carefully assembled and tested and ready to go out of the box. Every component is chosen to ensure a high quality upper is produced. Every upper is custom built to order and we go the extra mile to ensure the finished product is to your specifications. This 9mm upper starts with an AR-15/AR-9 MILSPEC Billet Aluminum receiver, mated to a White Label Armory 16 inch 9mm, 1:10 Twist, Nitride/Melonite treated barrel. White Label Armory is one of the major AR Parts manufacturer in the industry and they especially make great pistol caliber barrels. The Bowden Rail is a free floated system, M-LOK slots on all three sides, full length picatinny rail at the top, lightweight handguard. Barrel Nut is made out of solid steel to ensure a solid mounting system. This configuration has an extended handguard longer than the barrel, with a flash can to provide a sleek look and maximum sight radius. Bolt Carrier Group and Charging Handle is OPTIONAL. We offer a 9mm BCG from WL Armory,Properly Heat Treated, 8620 Single Piece Bolt, Nitrided and a Standard Charging Handle. SPECIFICATIONS UPPER RECEIVER: AR-15/AR-9 Mil-Spec Machined out of Billet Aluminum, Type III Hardcoat Anodized Black - No Forward Assist or Ejection Port Cover Needed BARREL: 16 inch, 9mm Caliber, 4150 Chrome Moly Vanadium Steel, 1:10 Twist, Nitride/Melonite Treated - made by White Label Armory HANDGUARD: 17 inch M-LOK Free Floated, Machined out of 6061 T6 Aluminum - made by Bowden Tactical GAS SYSTEM: Blowback System GAS BLOCK: Blowback System - No Gas Block Needed MUZZLE DEVICE: Kak Industry Slimline Flash Can 100% MADE IN THE USA OPTIONAL: ADD a WL Armory 9mm Nitride BCG and a Standard Charging Handle