New in wrap current production Colt M4 flat top upper receiver. This upper receiver is marked with the letter C and key hole symbol. It is also marked M4 and has M4 feed ramps. This receiver does not have the white RAS T numbers in the rail and the FWD assist and port door have not been installed. I am asking $225.00 plus shipping. Please contact me via IM or e-mail at CLM4@EV1.NET.