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The Sjögren Inertia is 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.
— In-Game Description
The Sjögren Inertial (also referred to as the Sjögren Inertial Shotgun) is a semi-automatic shotgun introduced in the Battlefield 1: They Shall Not Pass expansion for the Assault class. It is unlocked upon obtaining 50 kills with the Model 10-A Slug and obtaining 15 kills with the M97 Trench Gun Hunter in a single round. The Sjögren is available as a Factory or Slug variant.
Stats wise, the Sjögren Inertial has lower maximum damage than both pump-action shotguns. 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.
The Slug variant was added in the Weapons Crate update on May 7 2018. It comes equipped with an lens sight as well as 12 gauge shotgun slugs.