207,100. Ciano, A. March 3, 1923. Barrel.-A bomb - throwing attachment for rifles and machine guns comprises a tube a forming a continuation of the barrel bore, a large-bore tube b to receive the bomb, and a chamber d adapted to receive the explosion gases from the barrel and connected to the bomb tube b through a rerestricted orifice or nozzle f formed of two conical portions., as shown, or of a single converging conical portion.
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