I agree that it sounds as though the chamber needs to be finish reamed. If the barrel was installed and never headspaced for the breachblock, the 9mm round will not go far enough into the chamber to allow the toggle train to fully close.
You might just want to talk to our GT on this forum, as he has the necessary tools and the know how to fix you up. You could just send him your upper and toggle train and that can go USPS because it is not considered a firearm(read cheap shipping). I have done this very thing when I needed some of GT's expertise. He got me running 100%. Just a thought.
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