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Product Features & Specifications Chambered in 5.56, this pistol upper is completely built and ready to be put on a lower. Includes a Bolt Carrier Group. Brand: TacFire Model: Pistol Upper Assembly Caliber: 5.56x45mm NATO Barrel Length Range: 7" to 7.99" Firearm Fit: AR-Platform Sights: Optic Ready Barrel Material:4150 Chrome Moly Vanadium Barrel Finish: Black Nitride Muzzle: A2 Flash Hider Type: Complete Handguards: M-LOK Receiver Material: 7075-T6 Aluminum Barrel Length: 7" Receiver Finish: Black Anodized Handguard Finish: Black

Hi Jackie and welcome. This model has a 7-inch 4150 Chrome Moly Vanadium Barrel with a Barrel Twist Rate of 1-8, Threaded 1/2x28 with A2 Style Muzzle Device. Cheers, stay safe and enjoy!