Hey Guys. I have a gray Colt upper receiver from the original M16 that the Air Force had. It is in decent shape with a couple of nicks here and there. It has the A1 type rear sight with dust cover but no forward assist. The upper has standard .250"(small) front pivot pin. I got it with a 9mm Colt barrel. The only difference is that my upper has a hole for the gas tube. I would rather not have the gas tube hole. So I'm looking for the same thing that I have only no gas tube hole. Please let me know what you have.