A 3D printed model 1:1 scale of the Austro-Hungarian Legendary SMG, a gun that was lost in history. It was really hard to find good references to design it!
• Functionality:
The mag is removable. You can spin the reload mechanism, and the Bolt works!
 
• History:
This gun never saw the production line, only prototypes were made, and all of them were lost or destroyed. The only evidence the gun ever existed is three pictures from the Austrian National Library. It came in 2 Versions, with a stick magazine (Assault) with 20 bullets or drum magazine (Defensive) with 60 bullets. It had the capability to fire 650 RPM! Both versions were water-cooled (black tank on the gun barrel). 
Size: 75cm x 20 cm x 7 cm