Upgrade the performance of your AR15 build with this 6.5 Grendel Complete Upper Receiver. Designed to be a low recoil/high accuracy cartridge, the 6.5 Grendel is ideal for those looking to stretch the legs of their AR15 rifle, with proven results at 1000+ yards.The 6.5 Grendel is designed on the AR15 platform. You will need to purchase a 6.5 Grendel specific bolt carrier group (available now) and magazine (not currently offered - coming soon). All other components are standard to the AR15 platform. This upper assembly does not include a BCG or Charging Handle.Specifications:Manufacturer: Aero PrecisionCartridge: 6.5mm GrendelBarrel Length: 18 inBarrel Profile: SPRGas System Length: Rifle LengthBarrel Twist Rate: 1-8Threads per Inch: 5/8x24Handguard Type: Free-FloatMuzzle Device: A2 Flash HiderFinish: StainlessColor: BlackGun Model: M4, AR-15Condition: NewFabric/Material: 7075-T6 AluminumAttachment/Mount Type: M-LOKGas Block Journal Size-Diameter: .075 inHandguard Length: 15 inHandguard Style: Hybrid RailGun Rail: PicatinnyGun Make: Aero PrecisionIncluded Accessories: NoneBarrel Material: 416R Stainless SteelBolt Carrier Group Included: NoCharging Handle Included: NoWeight: 68.5 oz, 7 lb