Geissele Automatics Super Duty MOD1 Complete Upper Receiver Group The Geissele Automatics Super Duty MOD1 is the current evolution of the legendary Super Duty platform, designed and manufactured with confidence and without compromise. Built around a 16-inch Cold Hammer Forged, chrome-lined barrel in the distinctive Geissele Profile with a 1:7 twist rate, this complete upper receiver group delivers match-grade accuracy alongside exceptional durability. The Nanoweapon-coated Reliability Enhanced Bolt Carrier Group (BCG), featuring a Geissele Stressproof Bolt with an Asymmetric Cam Pin, ensures consistent, reliable cycling in even the most demanding environments. A precisely balanced gas system -- including the bomb-proof Super Compact Gas Block and fine-tuned .075" gas port sizing -- minimizes felt recoil while maintaining reliable function. Finished in black anodize and built for AR-15 compatibility, this upper is a complete, ready-to-run solution for tactical operators and precision shooters alike. Product Highlights Cold Hammer Forged Chrome-Lined Barrel: 16" Geissele Profile barrel with 1:7 twist rate delivers superior accuracy, extended barrel life, and enhanced corrosion resistance. Nanoweapon Reliability Enhanced BCG: Features a Geissele Stressproof Bolt with Asymmetric Cam Pin, high-pressure tested and magnetic particle inspected for unmatched dependability. HUXWRX Flash Hider-QD 556 Muzzle Device: Nanocoated muzzle device reduces muzzle flash and offers seamless, tool-free suppressor attachment with HUXWRX FLOW series compatibility. 15" SMR MK16 M-LOK Free-Float Handguard: Center-tab mated rail with stainless steel QD sling inserts provides extensive modularity and a rigid, heat-resistant platform for accessories. Geissele Airborne Charging Handle: Ambidextrous low-profile design improves ergonomics and prevents snagging on gear during dynamic use. Specs Brand: Geissele Automatics Model: Super Duty MOD1 Caliber: 5.56 NATO Barrel Length: 16" Barrel Profile: Geissele Profile Barrel Construction: Cold Hammer Forged (CHF) Barrel Finish: Chrome Lined Barrel Twist Rate: 1:7 Handguard: 15" SMR MK16 M-LOK Free Float Muzzle Device: HUXWRX Flash Hider-QD 556 Charging Handle: Geissele Airborne Bolt Carrier Group: Nanoweapon Reliability Enhanced BCG Bolt: Geissele Stressproof Bolt with Asymmetric Cam Pin Receiver: Super Duty Upper with Cam Pin Cut-Out Gas Block: Super Compact Gas Block Gas Port Size: .075" Gas System: Geissele Length Overall Length: 25 3/8" Weight: 4 lbs 5 oz (Approx.) Finish: Black Anodized Compatibility: AR-15 UPC: 810081133654 MPN: 08-548B Disclaimer: We strive to provide accurate and up-to-date product descriptions, specifications, and images; however, errors or omissions may occasionally occur. We are not responsible for any inaccuracies or discrepancies in the content provided. If you notice anything incorrect or unclear, please contact us so we can correct it. When in doubt, we recommend verifying details directly with the product&';s manufacturer. ]]>