Thanks for all the help. I've put 100 rounds through it now and the problem seems to be getting better. The trigger is great and it's dead on at 7 yds. All the surfaces mentioned look good, the only machine marks I can see are on the rail running down the long axis of the slide that the disconnector rides on. I disassembled again to clean and inspect, and noticed something just barely protruding out of the extractor. It's dead center and looks like a pin either not fully seated or trying to back out of the extractor. Any thoughts? Thanks again.