Geissele AR-15 Super Duty MOD1 Upper Receiver Assembly 5.56x45mm 16" Hbar Barrel M-LOK Black

Geissele 08-617B Super HBAR Upper Assembly 16" Heavy Bbl 5.56 Black ReceiverThe Geissele Super HBAR Upper Assembly model 08-617B features a 16" Cold Hammer Forged chrome-lined heavy barrel in 5.56 with a 1:7 twist built for durability and match-grade accuracy. Geissele 08-617B includes a Nanoweapon-coated Reliability Enhanced BCG with a Stressproof Bolt both HPT/MPI tested for reliability. A compact .812 gas block reinforced gas tube and tuned gas system support consistent performance under sustained fire. The 15" MK16 rail allows secure accessory mounting while the ambidextrous Airborne Charging Handle and HUXWRX QD flash hider add versatility. Ideal for serious tactical or precision applications.At Geissele Automatics we're committed to pushing the limits of quality and performance. Built on our trusted Super Duty platform the Geissele Super HBAR UpperReceiver is engineered for heavy-use applications while maintaining exceptional accuracy. It features a robust HBAR profile with a .812" gas journal custom-reinforced .812 gas block and a straight extra-thick Super HBAR gas tube-designed to handle sustained fire with superior heat mitigation.At the core is our in-house Cold Hammer Forged chrome-lined Super Heavy Barrel paired with a Nanoweapon-coated Reliability Enhanced Bolt Carrier Group. Both the barrel and Forged Stressproof Bolt are High Pressure Tested (HPT) and Magnetic Particle Inspected (MPI) ensuring extreme durability and match-grade precision under demanding conditions.The system includes a precision-fit .812 gas block and a straight gas tube for enhanced reliability and thermal control. It also comes equipped with the Nanocoated HUXWRX Flash Hider-QD fully compatible with the FLOW series suppressors for quick attachment and reduced back pressure.Finishing the build the MK16 rail with stainless steel QD inserts supports secure sling use while the Airborne Charging Handle offers ambidextrous functionality with a low-profile design that minimizes snags.Purpose-built for professional use the Super HBAR Upper embodies Geissele's drive for strength precision and innovation.