DoubleStar DS-4 AR-15/M4 Flattop 16″ Upper Receiver

DS4 16″ Barreled Upper. 5.56 Nato, 1.9 twist, M4 Feed Ramps, Forged upper Specifications for DoubleStar DS-4 AR-15/M4 Flattop 16″ Upper Receiver: Manufacturer: DoubleStar Cartridge: 5.56x45mm NATO, .223 Remington Overall Length: 16 in Barrel Length: 16 in Barrel Profile: M4 Barrel Twist Rate: 1-9 Muzzle Device: A1 Finish: Anodized Color: Black Gun Model: M4, AR-15 Fabric/Material: 7075-T6 Aluminum Gun Make: AR Platform Barrel Material: 4140 Chrome Moly Vanadium Magazine Included: No Package Contents: DoubleStar DS-4 AR-15/M4 Flattop 16″ Upper Receiver The DoubleStar DS-4 AR-15/M4 Flattop 16″ Upper Receiver is a quality addition to the DoubleStar lineup. For more great deals on AR15 Upper Receivers by DoubleStar, please browse our Doublestar Gun Parts page.