I recently saw a display of the two Thompsons used in the St.Valintines killing in Chicago. They are in the custody of the Barrin County MI. Sheriffs office. (one of the killers lived there). They were traced by ballistic testing of the bullets and case markings. (some 150 rnds. were fired). The test procedure was a new thing at the time, 1929. In a written report by the Chicago police dept. it states the Thompson had a right hane twist and only two guns "at the time have right hand twists, the 1917 Army ( S&W I think)) revolver in .45 and the Thompson. This surely is not correct, is it? Could it be a typo meaning left hand? What is the twist on these two guns?
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