A2 Light/Heavy barrel.  Marked C MP 5.56 NATO 1/7
Bayo lug and A2 Flash hider.  
C marked Bolt carrier, MPC marked bolt
A2 upper receiver with a C and M mark on the right side and a COLT 223 mark on the right LEFT side.

This is an upper only.
It is a small hole upper.  

It is gorgeous.

What model, and is it correct?

edit:  Corrected a whoopsie above.  The mark is on the Left side.

Quoted: A2 Light/Heavy barrel.  Marked C MP 5.56 NATO 1/7 Bayo lug and A2 Flash hider.   C marked Bolt carrier, MPC marked bolt A2 upper receiver with a C and M mark on the right side and a COLT 223 mark on the right side. This is an upper only. It is a small hole upper.   It is gorgeous. What model, and is it correct?

Any pics? The COLT 223 marking on the upper is interesting. I've never seen or heard of the caliber marked on the upper before.

I just sold a Colt flattop upper receiver that had "COLT 223" rollmarked on the LH side but no forge code or proof marks on the RH side. It was in original dark gray and a "small pin" too.

I have been told that mine was made by Colt but it was a conversion type upper assy'. In other words suppose you had a complete rifle with an A2 upper, BUT you also wanted a flattop. Well, with this assy' you swap your original upper for this one and, VOILA, instant flattop on the same lower!

Sounds like you haxe a conversion upper assy" too but with a forge mark. Go to BIGGERHAMMER.net and see if they have your forge code.


HTH