This might be nothing, but a carry handle upper I purchased recently came with some fairly significant damace to the left ear of the rear sight block ( that's what I get for being cheap and buying used...). It may just be my lying eyes, but the carry handle looks torqued to one side when viewed from the front, even more so when I have a scope mounted to it (to be fair it's a very cheap, very crappy Chinese knock off, so that might be the scope genuinely being off center). I've zeroed the irons at 25 yards and they don't look drastically different from how my other A1, so it might just be perspective. Sooner or later I'll take it out and try it at 100, but if it is bent, is this something that can be economically fixed, or is something like that not worth saving?

Get a new/used one. Used Colt ones can be had for $50. Worth it.

I don't see where he states it's a detachable carry handle. Is this an A2 upper?

If it is an A2 upper and the handle has been bent to the side somehow, sounds like replacement is the only path to make it right.

Where'd you buy the upper from?  Was it barreled already?  I'm wondering if it was held in a vice by the carry handle while a barrel was removed or installed?