The Geissele Super Duty MOD1 represents next-generation engineering for the AR-15 platform delivering unmatched performance accuracy and reliability with a 16" cold hammer forged barrel in 5.56 NATO and premium DDC anodized finish.Geissele Super Duty MOD1 Complete Upper Receiver16" Cold Hammer Forged Barrel with 1:7 twist rate5.56 NATO caliber chamberingDesert Dirt Color (DDC) anodized finishHuxWrx Flash Hider-QD Muzzle DeviceGeissele Airborne Charging Handle includedM-LOK compatible handguard systemAR-15 platform compatibilityManufactured with confidence and without compromise this complete upper assembly combines advanced technologies and premium components to deliver exceptional accuracy and reliability for tactical competitive and recreational shooting applications.