Ok I have one NIW replacement part Colt marked with that little C in a box at from of upper. It is sealed in the bag with a date of 10/82 and the NSN # on it. It is an m-16 upper with no foward assist. small front pin and all that. Stripped just the upper no small parts.
$175 shipped priority to your door.
These parts are really rare.
Im me if you want it. enjoy pics
Or will trade for a quantity of M-14 or like chinese m-14 mags.