7.92x33mm Kurz
Military Cartridge Stock
Many people think the first "Assault" Rifle was the
Russian AK- 47, but the Germans were 6 years ahead of the
AK-47 with the MKB42 Assault Rifle introduced in 1941
and used against the Russians in 1942 (WWII).
The 7.93x33mm Kurz was designed by shortening the
8x57mm (7.92) Mauser cartridge to 33mm long.  
The word "Kurz" means "Short" or "Shortened".
German MKB42
Assault Rifle