Here are photos of a CAR-15 upper, complete with CH/B/BC. It has an 11.5" barrel with 5.5" perm attached flash hider. The barrel is marked " SS 5.56". The upper is marked "C" and "H" in the depression under the A1 sight. It does not have a brass deflector and the FA is teardrop style. It has the front swivel and a bayonet lug. The bolt and carrier are in very good condition. It has small pivot hole. THe front sight post has 4 notches. The left side of the carry handle has a couple of small notches that show in the close-up photo. I got this upper as part of another "deal" and don't know much more about it. I have tried it and it runs great with XM193 and Q3131A. I don't know who made it or what the markings mean, if anything. I will include a sight adjusting tool that fits the A1 sight. It doesn't fit the front because the tool has 5 tabs.
I'm not sure what it is worth but $355 seems like a reasonable starting point. I will entertain offers but am not interested in trades. Paypal or M.O. Shipping included to lower 48.