I have built an AR Pistol that functions perfectly EXCEPT the bolt stop. The bolt stops, but it stops short of being back far enough to pick up a round. The bolt catch when operated MANUALLY does the very same thing: it stops the bolt carrier but not back far enough at all. The bolt stop, when operated manually stops the bolt about 1" forward into the ejection port. I have replaced the entire bolt catch system, I have tried a 2nd bolt carrier group, nothing seems to stop my bolt in the right place when operated manually or at full function upon empty. When you change to the next magazine, this forces you to drop the bolt, insert the newly loaded mag, then rack the bolt and it does fine. If you empty a mag, the bolt stops, but too far forward and it will not pick up a round.
Suggestions? No it has not been dry fired, yes I have tried 2 bolt carriers-same thing.
DR