I have a Colt A2 upper receiver complete with A2 sights and round forward assist. It is marked
CM on the carry handle and has 2 proof marks on the receiver near the front of the dust cover. I had this mounted on an SP1 lower and the color match was great. The receiver is in execellent shape. You will not be disappointed. The price is $150 shipped. Please contact me at firstname.lastname@example.org.