Gun History as Taken From The Coroner's Inquest Only two guns at the time had a "right hand" twist, the Colt Thompson submachine and the Model 1917 Smith & Wesson Revolver, which also fired the 45 auto ammunition. The Colt Thompson submachine gun had a six groove barrel 10 1/2 inches long, one turn in 16 inches, "right hand" twist. The jacketed bullets were an alloy of copper and 5% zinc and were given a nickel wash which gave them a shiny appearance sometimes mistaken for steel. They were manufactured only between July, 1927 and July, 1928. The cartridges fired in this case from both Thompson submachine guns at the Massacre scene were of the United States Cartridge Company. Identification was made of the ejector piece from gun Number 7580, Exhibit "A" and of the irregular firing pin from gun Number 2347, Exhibit "B". Microscopic identification was made of the bullets fired from each of the test guns. Thompson Number 2347 was marked Exhibit "B" and was determined to have fired one 50-round magazine at the Massacre scene. Thompson Number 7580 was marked Exhibit "A" and was determined to have fired one twenty-round magazine at the Massacre scene. The two Massacre Thompsons numbered Number 7580 and Number 2347 were positively identified by Colonel Calvin Goddard in December of 1929 after investigating many Thompson guns found in the Chicago area.
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