Colt IAR 5.56 Upper Receiver Assembly 11.5" Barrel

Colt IAR 5.56 Upper Receiver Assembly 11.5" Barrel Manufactured by Colt IAR (Infantry Automatic Rifle) Upper 5.56x45mm NATO caliber 11.5" 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 Magpul MBUS Pro flip-up rear sight  Colt Radian Raptor charging handle "C" marked Colt upper receiver "C" marked Colt full-auto bolt carrier group New Old Stock US Gov't Overrun *Uppers may show small blemishes from handling storage* Manufactured by Colt, the IAR6933CK complete upper receiver assembly is chambered in 5.56x45mm NATO and was developed at the request of FBI HRT for a short-barrel IAR variant. It features a monolithic upper receiver with an uninterrupted full-length top rail that free-floats Colt’s heavy 11.5" chrome-lined, CAGE code–marked barrel, optimized for durability and sustained fire. Designed for enhanced heat management, the system incorporates an integrated heat sink, along with a gas-block-mounted flip-up front sight and a Magpul MBUS Pro flip-up rear sight. Additional features include a “C” marked Colt upper receiver, a “C” marked Colt full-auto bolt carrier group, and a Colt Radian Raptor charging handle, with an A2 flash hider installed at the muzzle. For optimal performance, use with an H2 or H3 buffer is recommended.