DoubleStar Barreled Upper Receiver .224 Valkyrie 24 inch Barrel Bull Profile Diamond National Free Float Handguard Black. Specifications for DoubleStar .224 Valkyrie Upper w/Diamond National Free Float Handguard: Manufacturer: DoubleStar Caliber: .224 Valkyrie Overall Length: 24 in Barrel Length: 24 in Barrel Profile: Bull Gas System Length: Rifle Length Barrel Twist Rate: 1-7 Handguard Type: Free-Float Muzzle Device: No Finish: Anodized Color: Black Fabric/Material: 416 Stainless Steel Included Accessories: Free Float Handguard Magazine Included: No Features of DoubleStar .224 Valkyrie Upper w/Diamond National Free Float Handguard National Match Free Float Handguard Picatinny Rail Aluminum Gas Block Standard Mil Spec Flattop Upper Receiver. Package Contents: DoubleStar .224 Valkyrie Upper w/Diamond National Free Float Handguard This screaming fast 224 Valkyrie Barreled upper comes with a 24 stainless bull barrel and will allow supersonic projectiles out to 1000 yards. Features/Specifications: Caliber-224 Valkyrie-Barrel-24 416 Stainless Steel Bull-1-7 twist-National Match Free Float Handguard-Picatinny Rail Aluminum Gas Block-Standard Mil-Spec Flattop Upper Receiver.