The Geissele Super Duty MOD1 complete upper receiver delivers unmatched performance accuracy and reliability for the AR-15 platform. Manufactured with confidence and without compromise this 5.56 NATO upper features a 16-inch cold hammer forged barrel with 1:7 twist rate and anodized finish.Geissele Super Duty MOD1 Complete Upper Receiver5.56 NATO caliber with 16-inch cold hammer forged barrel1:7 barrel twist rate for optimal accuracyM-LOK handguard system for versatile accessory mountingHuxWrx Flash Hider-QD muzzle device includedGeissele Airborne Charging Handle includedAnodized finish for durabilityThis next-generation upper combines advanced technologies and proven engineering to provide superior performance for tactical competition and recreational shooting applications on the AR-15 platform.