Is it one of the new Thompsons? There were some original semi-auto Thompsons made also.
There are several good books on the Thompson if you wish to add to your library. One of the most thorough IMHO is "American Thunder" books by Frank Iannamico, though these are basically on the military Thompsons. Also Thompson - The American Legend: First Submachine Gun by Tracie L Hill and William J. Helmer is an excellent read. Beware both books are now rather expensive though.
There are several websites dedicated to the Thompson where you may want to ask also Search for the thompson Collectors Associaton.
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