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The SM-9 is a machine pistol of Guatemalan origin and manufactured by Cellini-Dunn. It is blowback operated, firing from an open bolt and can use magazines from Ingram MAC-10 submachine guns inserted into a similar grip. The layout of the receiver is somewhat simpler than that of a Sten with its internal components light in weight enabling a very high rate of fire. Its forward pistol grip can hold a spare magazine as well as handling the weapon when firing.