Geissele Automatics Super Duty Mod 1 13.90" Upper 5.56x45mm 1:7 M-LOK Rail with BCG and CH, Desert Dirt – 08-546S

The Geissele Super Duty MOD1 Upper delivers cutting-edge performance and reliability in a next-generation AR-15 platform. At its core is the Super Modular Rail MK16, securely mounted with a center-aligning tab to prevent rotation-a combat-proven design currently fielded by USASOC.
Included is the Reliability Enhanced Bolt Carrier Group, coated in Nanoweapon for extreme wear and corrosion resistance. It features a chrome-lined, properly staked gas key, H13 medical-grade steel cam pin, and extended upper rails for smoother cycling. The BCG houses the Geissele Stressproof Bolt, forged from Carpenter 158+ steel developed in collaboration with Carpenter Steel for superior strength, fatigue resistance, and up to 5x the lifespan of a standard bolt. Each bolt is high-pressure tested, MPI-inspected, and coated for durability.
Combining advanced materials, engineering, and combat-proven design, the Super Duty MOD1 Upper is built for those who demand unmatched accuracy, dependability, and performance.