Thompson submachine gun M1921
Developed too late to be used in World War 1, the "Chicago Typewriter" was made famous by gangsters in the 1920s-1930s. For WW II the 50 and 100 round drum magazines were eventually discarded in favour of the 30 round stick magazine (shown on the left) and the front grip changed, plus the cocking lever moved from the top to the side.
The FBI used Tommy Guns from 1933 right up until the 1960s.
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