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 6.5 Grendel upper starts with an AR-15 MILSPEC 7075 T6 Forged Aluminum receiver, mated to a Tactical Kinetics 18 inch 6.5 Grendel, Mid Length Gas System, 1:8 Twist, Govt 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 6.5G 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. We also offer a CHOICE of Muzzle Devices - upgrade the flash hider to a Black or Stainless Competition Muzzle Brake. This is an enhanced version of the popular style muzzle brakes. The baffles and ports are milled larger to drive pressure up and to keep the muzzle down more effectively. We can also UPGRADE the GAS BLOCK to an Adjustable Gas Block. Great option if you are using a suppressor or just want to fine tune your system. 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: 18 inch, 6.5 Grendel Caliber, 4150 Chrome Moly Vanadium Steel, 1:8 Twist, Govt Profile, Nitride/Melonite Treated - made by Tactical Kinetics HANDGUARD: 15 inch M-LOK Free Floated, Machined out of 6061 T6 Aluminum - made by Bowden Tactical GAS SYSTEM: Mid Length, Direct Impingement, Stainless Steel Tube GAS BLOCK: Low Profile Gas Block, Machined out of 4140 Steel MUZZLE DEVICE: Standard A2 Flash Hider with Crush Washer 100% MADE IN THE USA OPTIONAL: UPGRADE Muzzle Device to a Black or Stainless Competition Muzzle Brake OPTIONAL: ADD an Azimuth Nitride 6.5 Grendel M16 Profile BCG and a Standard Charging Handle OPTIONAL: UPGRADE GAS BLOCK to an Adjustable Gas Block OPTIONAL: COLOR Change to a Magpul FDE Colored Receiver and 15 inch M-LOK Magpul FDE Colored Handguard