This is a factory Colt 16" lightweight fixed handle A2 upper assembly. The upper was taken off a new-in-box preban blue label Sporter Lightweight (R6530-.223). The upper is in perfect condition. This upper is preban configuration with flashider, but no bayonet lug. The upper is properly marked with "C MP 5.56 NATO 1/7" on the barrel, a "4" above the gas tube hole, and a "4" stamped on the barrel chamber. The "4" indicates the upper/barrel has the factory M4 feed ramps. It has a small front hole. The upper does not include the bolt/bolt carrier or charging handle.
If requested, I can email pictures or clarify any questions.
The upper is sold. Thanks.