Was that Thompson a pistol or rifle?
Mine was the 1911 style pistol. I also had a couple of .45s made by Auto Ordinance and they were rougher. One regularly failed to extract. Fortunately a new extractor cured the problem. I looked it up in the NRA take down book and it was ridiculously easy to replace. Actually the entire 1911 is easy to detail strip if you have the instructions.
One of the .45s had a slight blemish in the bore, it looked like a tiny pit. I phoned Auto Ordinance and the sent me a new barrel for free. The new one was not as accurate as the old blemished one so I just kept it as a spare. I phoned them and they told me by all means keep the original and the replacement for free. I mentioned that the new barrel fit more tightly than the original and the worker told me they needed a Little looseness at the edge of where the chamber hood met the frame. I took some emery paper and removed just a tiny bit of metal from the back of the barrel hood.
Oddly the blemished one was very accurate.
They did make a Tommy Gun in 10mm but I never even saw one.