The Model PPK is a double-action, semiautomatic pistol. It has a blow back operation where the slide remains to the rear after the last cartridge has been fired. A disconnector prevents firing more than one shot at the pull of the trigger.

Cartridge Pin Indicator found on most models of the PPK except the .22 caliber. The cartridge pin indicator extends rearward through a hole in the rear of the slide when a cartridge is in the chamber. The indicator pin touches the cartridge case forcing the indicator pin back outward. On the .22 caliber pistols there are no indicators because of the .22 rimfire ammunition. The indicator pin was optional at the beginning of the Model PPK production, but near the end of World War II it was omitted 50% of the time.

Sights are fixed front and rear with the front sights being notched to enable it to receive the night sight attachment.

Magazine Release Catch are push button; located on the left side of the frame to the rear of the trigger on all calibers; as well as thumb release button at the base of the frame to the rear of the magazine on some 7.65 and 9mm models.

Safety Lever is located at the left side in the rear of the slide grip. The safety lever points forward toward the muzzle for Fire, and downward at an angle of either 60 ° or 90 ° depending on the model for the Safe position. When the safety lever is on Safe the sear is locked. The trigger cannot be pulled as the safety lever shaft stops the hammer from striking the firing pin. When the hammer is in the cocked position and the safety lever is moved to the safe position, the hammer is then automatically released onto the safety lever shaft which prohibits firing. When the safety lever is pushed forward to the Fire position, the trigger will then return to the double action position.

Continued in History Part 2.