I have shot cases of surplus, steel cased, corrosive ammunition through my VZ58, as well as a number of other Milsurps. I clean them when I get home from the Range and have never had a problem. All my guns are like new. Don't know what people's problem is with surplus ammo. Sure, if you are going to shoot it and then it's too much trouble to clean your gun you may have problems, but if it's too much trouble to clean your gun in a peacetime setting, you probably don't deserve to own anything of any value.