It is corrosive, all comblock stuff was. Corrosively-primed ammo lasts longer in storage and, when you have conscripts you can force to clean their weapons, then being corrosive was no problem. With the CZ-52 and Tokarev, though, cleaning for corrosive ammo is simplicity itself. Just remove the barrel and was with soapy water. Then, clean as normal and then oil. It takes no time to do. I won't shoot corrosive in my rifles because it is harder to clean (though not that big of a deal, either). But, in handguns if corrosive equals half price, sign me up!
Ash