LaRue Tactical Complete Match Grade Upper Receiver 18in 6.5 Grendel 1-7 Twist A2 Flash Hider Black. 5 Grendel MGU Its widely-recognized that were crafting the most accurate production rifles on the planet. But if youve got any other type of AR-15 you can buy and drop this new LaRue MGU onto your any-brand AR-15 lower toss on a magnified scope use match ammo or your own handloads and easily shoot under 1-inch groups at 100 yards. Specifications for LaRue Tactical Complete Match Grade 18in 6.5 Grendel Upper Receiver: Manufacturer: LaRue Tactical Caliber: 6.5mm Grendel Overall Length: 26.5 in Barrel Length: 18 in Barrel Profile: Standard Gas System Length: Mid Length Barrel Twist Rate: 1-7 Threads per Inch: 5/8x24 Muzzle Device: A2 Flash Hider Finish: Anodized Color: Black Gun Model: AR-15 Condition: New Fabric/Material: Aluminum Gas Block Journal Size-Diameter: .750 in Handguard Length: 13 in Gun Rail: Picatinny Gun Make: AR Platform Magazine Included: No Last Chance: Yes Package Contents: LaRue Tactical Complete Match Grade 18in 6.5 Grendel Upper Receiver What firearm models does the manufacturer say LaRue Tactical Complete Match Grade 18in 6.5 Grendel Upper Receiver is compatible with? The manufacturer says that LaRue Tactical Complete Match Grade 18in 6.5 Grendel Upper Receiver is compatible with AR-15LaRue Tactical LT-016: Complete Match Grade Upper Receiver 18in 6.5 Grendel 1-7 Twist A2 Flash Hider Black