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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 fed from 36-round magazines inserted into a pistol 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 removable forward pistol grip not only holds spare magazines but can be rotated 45 and 90 degrees for left/right handed operators as well as handling the weapon when firing.