Wondering if the op has got this sorted out yet? Tried a proven lower on the uppers?
I have. Sorry for the late response. I did try it on proven lowers and they didn’t work. Same issues as before. It turns out there were a few made with slightly smaller gas ports and they got passed everyone. Long story short, I sent them back to the manufacturer and they will quickly repair and send them back. They were very helpful. I appreciate all the help from all y’all. My next thing with these may be the silent captured spring buffer. Those look and sound like a good thing.
