Walther PP with heel magazine release
In 1931 Walther decided to chamber the PP and PPK in 9mm kurz. They used the standard
frames and an enlarged barrel with some slight modifications to handle the more powerful cartridge. Two metal pins were added to
each side of the top of the chamber at the breech. These pins were 1/8" long and extended rearward to help feed the heavier cartridge into the chamber. The face of the breech was extended to ensure reliable feeding from the magazine. The magazines and followers were beefed up as well to handle the kurz round.
A major mechanical feature was added during this time. That was the heel magazine release as is found in the P.38 and P5, eliminating the pushbutton found on the left side of the frame on most other PP's and PPK's. These pistols were produced with this feature for only twelve years, and are very scarce, if not somewhat rare. Some of the very rare models with this feature are:
Photo courtesy of Midwest Firearms / midwest2@cwix.com