I recently bought a CZ 50 and took it to the range. After 20+ shots it would not discharge any rounds. I took a quick look at the primer and noticed a small dent in it, but that was all.. I stripped the gun and found the firing pin a wee bit too small. It seemed to be worn for a millimeter or so... (old gun / 1964)..
I'm considering to buy a Harrington replacement firing pin. Does anyone have any experience with this type of aftermarket firing pins? They look nothing like the original "flat" firing pin wich is in the pistol right now.

Harrington Products firing pins. Top to bottom:
CZ-52-1 Original military design
CZ-52-2 Competition firing pin
CZ-52-3 Heavy competition firing pin
CZ-50/70-2 CZ-50/CZ-70 firing pin