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 kit starts with an AR-15/AR-9 MILSPEC 7075 T6 Billet Aluminum receiver, mated to an Alpha Shooting Sports 8 inch 9mm, 1:16 Twist, Nitride/Melonite treated barrel. Alpha Shooting Sports is one of the major AR Parts manufacturer in the industry and they especially make great pistol caliber barrels. Feed cones on their barrels are larger to accomodate a larger variety of bullet types. The Axis 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. Comes with the Bolt Carrier Group and Standard Charging Handle, lower parts kit and stabilizing fin/blade kit - everything included to turn your stripped lower receiver into a full pistol/rifle. SB Tactical SBA3 Adjustable Brace is OPTIONAL. Features a minimalist design, integral and ambidextrous QD Sling socket and capable of accepting milspec carbine buffer tube extensions. Also an OPTION is COLOR. We can change the receiver and handguard to MAGPUL FDE (FLAT DARK EARTH) COLOR (see pictures). We can also UPGRADE the TRIGGER to a Rise Armament RAVE 140 or a Timney Impact Trigger. Great option if you are looking for a lighter and more crisp trigger pull. We also offer an OPTION to add a 80% 7075 T6 Aluminum Milspec Lower Receiver (Raw or Anodized) to your kit. 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: 8 inch, 9mm Caliber, 4150 Chrome Moly Vanadium Steel, 1:16 Twist, Nitride/Melonite Treated - made by Alpha Shooting Sports HANDGUARD: 7 inch M-LOK Free Floated, Machined out of 6061 T6 Aluminum - made by Axis MFG GAS SYSTEM: Blowback System GAS BLOCK: Blowback System - No Gas Block Needed MUZZLE DEVICE: Standard A2 (Enlarged to 9mm) Flash Hider and Crush Washer BOLT CARRIER GROUP: 9mm Caliber, Properly Heat Treated, 8620 Single Piece Bolt, Nitrided CHARGING HANDLE: Standard Charging Handle LOWER PARTS: UNBRANDED AR ELG Lower Parts Kit BLADE/BRACE: AR-15 Stabilizing Fin/Blade Kit - includes stabilizing fin/blade, standard buffer spring, 7.5 oz pistol caliber buffer, castle nut, latch plate and pistol buffer tube. 100% MADE IN THE USA OPTIONAL: UPGRADE TRIGGER to a Rise Armament RAVE 140 or a Timney Impact Trigger OPTIONAL: ADD a 80% Milspec Aluminum Lower Receiver (Raw or Anodized) OPTIONAL: UPGRADE BLADE to a SB Tactical SBA3 Adjustable Brace OPTIONAL: COLOR Change to a Magpul FDE Colored Receiver and 7 inch M-LOK Magpul FDE Colored Handguard