DoubleStar Barreled Upper Receiver .224 Valkyrie 18 inch Barrel Heavy Profile 15 inch Cloak M-LOK Handguard A2 Flash Hider Black. Specifications for DoubleStar .224 Valkyrie Upper w/Cloak M-LOK Handguard: Manufacturer: DoubleStar Caliber: .224 Valkyrie Overall Length: 18 in Barrel Length: 18 in Barrel Profile: HBAR Muzzle Device: A2 Flash Hider Finish: Anodized Color: Black Handguard Length: 15 in Gun Rail: M-LOK Magazine Included: No Features of DoubleStar .224 Valkyrie Upper w/Cloak M-LOK Handguard Caliber-224 Valkyrie-Barrel-18" 4140 Chrome Moly HBAR 1x7 twist-DoubleStar Cloak Free Float Handguard 15.5"-A2 Flash Hider-Low Profile Steel Gas Block-Standard Mil-Spec Flat Top Upper Receiver. Package Contents: DoubleStar .224 Valkyrie Upper w/Cloak M-LOK Handguard This screaming fast 224 Valkyrie Barreled upper comes with a 18 HBAR barrel and will allow supersonic projectiles out to 1000 yards. Features/Specifications: Caliber-224 Valkyrie-Barrel-18 4140 Chrome Moly HBAR 1x7 twist-DoubleStar Cloak Free Float Handguard 15.5-A2 Flash Hider-Low Profile Steel Gas Block-Standard Mil-Spec Flat Top Upper Receiver.