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 9x39 upper starts with an AR-15 MILSPEC 7075 T6 Forged Aluminum receiver, mated to a Tactical Kinetics 8.5 inch 9x39, Pistol Length Gas System, 1:7 Twist, Medium Profile, Nitride/Melonite treated barrel. Tactical Kinetics is one of our major partners and they produce high quality, accurate 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. Bolt Carrier Group and Charging Handle is OPTIONAL. We offer a 9x39 BCG from Azimuth, M16 Profile, Properly Staked Gas Key, MP Tested, 8620 Carrier, 9310 Bolt, Nitride Treated and a Standard Charging Handle. Azimuth Technology is a military contractor and one of the largest BCG manufacturers in the industry. Also an OPTION is COLOR. We can change the receiver and handguard to MAGPUL FDE (FLAT DARK EARTH) COLOR (see pictures). SPECIFICATIONS UPPER RECEIVER: AR-15 Mil-Spec Machined out of 7075-T6 Forged Aluminum, M4 Feed Ramps, Type III Hardcoat Anodized Black with Forward Assist and Ejection Port Cover Installed BARREL: 8.5 inch, 9x39 Caliber, 4150 Chrome Moly Vanadium Steel, 1:7 Twist, Medium Profile, Nitride/Melonite Treated - made by Tactical Kinetics HANDGUARD: 7 inch M-LOK Free Floated, Machined out of 6061 T6 Aluminum - made by Bowden Tactical GAS SYSTEM: Pistol Length, Direct Impingement, Stainless Steel Tube GAS BLOCK: Low Profile Gas Block, Machined out of 4140 Steel MUZZLE DEVICE: Standard A2 (Enlarged to 9x39) Flash Hider with Crush Washer 100% MADE IN THE USA OPTIONAL: ADD an Azimuth Nitride 9x39 M16 Profile BCG and a Standard Charging Handle OPTIONAL: COLOR Change to a Magpul FDE Colored Receiver and 7 inch M-LOK Magpul FDE Colored Handguard