The Russkis developed a slightly more substantial bullet (9x18mm Makarov) for it and after that advised many of the satellite states to create a gun like it, that is how you have the FEG PA-63, CZ 82 and PA64 military surplus pistols.The new optic has an onboard rangefinder, illuminated reticle, 20 mils of vertical turret travel and HUD (Heads Up S