How about a Wauser?
Here we see what looks to be a 1930s-era C96 “Broomhandle” Mauser Model 712 Schnellfeuer auto pistol (or, Blaster if you prefer…) currently in the Royal Armouries Collection.
However, on closer look, it is a Chinese-made copy of a 712 covered with badly emulated spurious markings and a substandard rust bluing “though appearance is closer to browning.” Marked “Manufactured by the Third Battle Area Arms Repair Department,” the banner scroll reads “Wauser.”
C96s were a cottage industry in China for decades, where they were known as “box cannons” and carried/sold as status symbols among warlords and village strongmen from the Yalu to the Yangtze.