I found some interesting photos on the internet that show the Steyr-Hahn Model 1912 pistol that was converted to full auto in 1916. Also included was a 16 round extended magazine This pistol used the powerful 9x23mm Steyr cartridge. Besides the standard 1916 conversion to full auto there was also the Steyr-Hahn Doppelpistol which used two pistols on one stock.Attachment 112140Attachment 112139