Seems a little tight on the buffer. Just going by the pics it's a lower issue and not an upper. You got some excellent advise above. Use it and even if its registered, call spikes. See if they can fix it with the same serial number. If not, well you will just have to wait again on the damn ATF. These things can be a pain but its what we have.
ETA: looking at pics, it doesn't look that bad. Then again I'm not pulling the pins. Your call.

