Any information out there about this unit???

What information do you want?  Over the years, Colt has bought forgings from any number of places, which is why they went to marking them w/both the "C" for Colt and the (usually) first letter of the forges name. No big deal. I have Colt uppers on three of my ARs; a CH, CK (for Kaiser) and a very early M16 Air Force contract piece that's totally unmarked except for the Colt proof marks ahaed of the ejection port.[:D]

Thanks for the help[beer]