OK, I see that. I'm trying to identify the manufacturer of my upper.
You asked us to ID your upper, but you posted a pic of a marking on your rail, not your upper. Post pics of the markings that are on your upper receiver. Even then, we will more than likely only be able to ID the company that forged it.
Magpul allows any company to use MLOK on their rails without paying for the right, as long as they put the Magpul MLOK logo on the rail.