Sjögren shotgun

The Sjögren Inertia Shotgun (marked: Automat, system Sjögren Patent)^[2] is a 12–16 gauge semi-automatic shotgun that was designed by the Swedish inventor Carl Axel Theodor Sjögren, initially manufactured by AB Svenska Vapen- och Ammunitionsfabriken in Sweden^[3] and then by Håndvåbenværkstederne Kjøbenhavn in Denmark.^[1][4] It used an inertia system later revived by the Italian firm Benelli and today widely used in shotguns.

Sjögren Shotgun
A Sjögren shotgun on display
Type	Semi-automatic shotgun
Place of origin	Sweden
Production history
Designer	Carl Axel Theodor Sjögren
Designed	Patents issued in 1900, 1903 and 1905[1]
Manufacturer	AB Svenska Vapen- och Ammunitions Fabriken, Stockholm[1] Håndvåbenværkstederne Kjøbenhavn, Copenhagen
Produced	1908–1909
No. built	c. 5,000
Variants	None
Specifications
Cartridge	12 gauge 16 gauge[2]
Action	recoil[3]
Feed system	5-round internal magazine, tubular magazine on shotgun, box magazine on rifle
Sights	bead

A small number of semi automatic military rifles in 7.62×63mm calibre were based on the Swedish Mauser using the Sjögren system, fed from internal seven round magazines, were also built, and tested by potential buyers, but found no market.^[1]