Colt IAR 5.56mm Upper Receiver Assembly 16″ Barrel
- Manufactured by Colt
- IAR (Infantry Automatic Rifle) Upper
- 5.56x45mm NATO caliber
- 16″ chrome lined heavy barrel (CAGE code marked)
- Colt designed heat sink for heat dissipation during extended periods of fire
- Monolithic rail system
- Flip-up front sight
- Matech flip-up rear sight
- Charging handle and full-auto bolt carrier group are included
- “C” marked Colt upper receiver
- New Old Stock US Gov’t Overrun
- *Uppers may show small blemishes from handling & storage*
Manufactured by Colt, the IAR6940CK complete upper receiver assembly is a 5.56x45mm NATO IAR (Infantry Automatic Rifle) upper built to compete in the M27 program and offered as New Old Stock U.S. Government overrun. This monolithic upper features an uninterrupted full-length top rail that free-floats Colt’s heavy 16″ chrome-lined, CAGE code–marked IAR barrel, designed for durability and sustained fire. A Colt-designed heat sink enhances heat dissipation during extended firing, while the gas-block-mounted fixed front sight post and Matech flip-up rear sight provide reliable iron sight capability. The assembly includes a charging handle and full-auto bolt carrier group, a “C” marked Colt upper receiver, and an A2 flash hider installed at the muzzle. For optimal performance and reliability, use with an H2 or H3 buffer is recommended.
