The Steyr Hahn aka Hammer or M1912 was a service pistol in Austria. It shoots a 9mm Steyr cartridge which is similar to a 9x23mm. The pistol has an internal magazine and uses stripper clips to load it similar to a Mauser.

Steyr did make an extended magazine variant.

And during Dickson’s Steyr factory tour he took a picture of a M1912 with a stock.

Below is a photo he took in a Military Museum in Hungary of the M1912 extendend with stock machine pistol.

Iraqveteran has a semi auto version.