The Standschütze Hellriegel 1915 was a water-cooled submachine gun chambered for 9×23mm Steyr rounds. Contrary to popular belief, the weapon is not belt-fed; the magazine was connected to the weapon by means of a flexible connector. This design element gave the weapon the appearance of being belt-fed. The 160-round drum was spring-tensioned, and the weapon can also use 20-round stick magazines. The barrel was also fitted with a water cooling jacket. Although the term "submachine gun" had not yet been coined in 1915, the Standschütze Hellriegel is an example of a "heavy submachine gun".
It was produced in very limited numbers, and never progressed past the prototype stage.
- The Standschütze Hellriegel 1915 is notable for appearing in the WWI-themed video game, Battlefield 1.