I don't think that is a Colt variant. It follows the pattern of the Colt, but bear in mind that there are a number of non-standard (and probably unlicensed) manufacturers of Colt pattern rifles in the world. The parts are easy to get and the hard part is the manufacture of the receiver. You can do that with some relatively simple dies and an aluminum casting machine. Presto, you have an arms plant.
I don't think that is a Colt because the sight rail is wrong, the forend is wrong (not Colt) and I can't see a forward assit device.
I was just going by size and shape. I guess it would be a knockoff of the M-4 then. I knew there were tons of versions of all the AR-15 variations.
Also noticed it was the only one of it's genre in the picture, the rest look like AK's.