Geissele AR-15 Super Duty Upper Receiver Assembly 5.56x45mm 16″ Cold Hammer Forged Barrel M-LOK

Experience top-tier tactical performance with the Geissele AR-15 Super Duty Upper Receiver Assembly. Engineered to meet the rigorous demands of duty and military applications, this complete 16-inch upper receiver assembly is chambered in 5.56x45mm NATO and constructed with a premium Cold Hammer Forged (CHF) chrome-lined barrel for extreme durability and exceptional accuracy.

This complete assembly includes Geissele’s enhanced Reliability Enhanced Bolt Carrier Group (REBCG) with Nanoweapon coating for corrosion resistance and ultra-low friction, alongside the Airborne Charging Handle (ACH). Wrapped in the rigid Super Modular Rail (SMR) M-LOK handguard, the Super Duty upper provides full-length top rail space and rock-solid mounting for lights, optics, and accessories.

• Caliber: 5.56x45mm NATO (.223 Remington compatible)

• Barrel Length: 16 Inches

• Barrel Construction: Cold Hammer Forged (CHF), Chrome-Lined

• Bolt Carrier Group: Geissele REBCG with Nanoweapon Coating

• Charging Handle: Geissele Airborne Charging Handle (ACH)

• Handguard: Free-Floating Geissele Super Modular Rail (SMR) M-LOK

• Use Case: Complete AR-15 rifle builds, duty setups, home defense, and high-volume tactical training

Features

Included 15” Super Modular Rail MK16 and Noncoated Closed-Tine Flash Hider
Nanoweapon coating provides maximum corrosion and wear resistance
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Made In United States of America