Looks very promising so far - Geissele USASOC AR15/M4/M16 Upper Receiver Complete Group

I received this promptly from Optics Planet. I have not shot this yet so this is all subjective observation. It is a very solidly built, well finished upper. It was a little more 'golden' in hue than I had expected. Not a negative. Well packaged. It came with a three wire braided spring and an H1 buffer. The spring was what I would have used if none came with it. The upper was well-oiled with some light viscosity oil. The charging handle looks decent. Until I actually shoot it, not much else to say but if there are any faults when I do shoot it I will make another post. That said, 9-Hole Reviews really seemed to like it.