Op Check complete. Well, ~20 rounds or so. I was shooting in a 2-gun competition today with my other SBR upper (which worked flawlessly) and then went around the corner and shot a few rounds to see if this thing cycled. I'll zero it and play with it some more in a day or two. Even in the rain, it's fun to shoot in Florida. (I'll try and get a video next time)
As an aside, I was messing with buffers today. My piston upper is a little harsh with a H buffer and I think a little over-gassed. I brought a H2 with me and put it in the gun. It's noticeably smoother and still cycled fine. And now all the brass is going forward instead of directly for my brass deflector. Uh oh, I've mentioned a gas piston...don't tell anyone over at M4c.net. <insert rolling eyes emoticon>