Sorry about being so vague on my previous post. I was very aggrivated after working on this gun for 2 days. I had just gotten back from the range and had to get to bed. What it's doing is, when it chambers a round it does not reset the trigger each time only every other shot or so. If I cycle it manually it will reset every time. When I try and shoot high brass on setting 1 is when this accures. It didn't do this until I drilled the ports to 3 32's. I have tried lightly polishing the bolt and rails. This did not help at all. Gun has approx. 300 rounds through it. Don't understand why it will