I have gotten quite a lot of questions about this experimental Austrian 1915 machine gun or submachine gun since it was included in the Battlefield One computer game. Unfortunately, the sum total of information we have on this weapon is three photographs found in an Austrian archive. Extrapolating from those photos, we can tell that it was a water-cooled, pistol caliber weapon fed by both stick magazines and drums. To the best of my knowledge, no example survives, as the weapon never went beyond an initial firing trial. For more information, I recommend Matthew Moss's excellent article at HistoricalFirearms.info.