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The Standschütze Hellriegel 1915 is a water-cooled submachine gun produced in very limited numbers for the Austro-Hungarian reserves (Standschütze) during World War I, by a designer identified only as "Hellriegel". A highly obscure weapon, no complete examples are known to still exist, and little official documentation remains. As a result, its operating mechanisms, exact production numbers and development history are all based on speculation. However, photographic evidence exists of it in live-fire tests which are dated October 1915, making it one of the earliest submachine gun designs in history.
The weapon could be fed from either box magazines or chute-fed. Contrary to its in-game depiction, the drum magazine developed for the Hellriegel could not be attached to the weapon itself; it was designed to be carried by another soldier. It is unknown why the weapon did not progress beyond the prototype stage.
— In-game description
A Hellriegel 1915 Storm variant, equipped with a Buckhorn Sight, assumedly reduced recoil and increased zoom, can also be found in a crate in the War Story, Through Mud and Blood.
The Hellriegel 1915 is unlocked upon reaching rank 10 with the Assault kit. The weapon's high magazine capacity of 60 rounds makes it extremely effective against enemies in close quarters compared to other submachine guns and LMGs. Despite this, its relatively moderate recoil makes it somewhat difficult to engage enemies at longer ranges unless controlled shots are fired. It also overheats after 40 bullets straight.
The Hellriegel only comes with 120 rounds (including the 60 in the starting magazine), meaning that running out of ammunition is a common problem. Playing near Support teammates that often drop ammo crates or pouches alleviates this problem.
A Defensive variant is equipped with a bipod and a extended 120 round magazine had been added to the CTE. It is unlocked by obtaining 300 kills with the Factory variant and performing 25 kills with the Anti-Tank Mines.
- A glitch in the class ranking system allowed players to purchase the weapon before being level ten in the Assault class. This was due to the system incorrectly tracking values higher than what was intended. This was fixed in a patch but allowed players to keep the weapon if already purchased, even if the rank 10 criteria had not been met.