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The Sjögren Inertia was a 12 gauge semi-automatic shotgun designed by Swedish inventor Carl Axel Theodor Sjögren produced from 1908 to 1909. It used an inertia system later revived by the Italian firm Benelli and today widely used in shotguns. The shotgun had limited service in World War I by both the Allies and the Central Powers.
Stats wise, the Sjögren Inertial has lower maximum damage than either pump-action shotgun (M97 Trench Gun and Model 10-A). In this respect, it can be seen as a compromise between the faster fire rate of the 12g Automatic and the higher damage of the pump-action shotguns. Unlike the 12g Auto, the Sjögren Inertial can kill on one shot at close ranges.