I assume that all 7.63x39 made by Norinco and all the cases of communist spam cans are corrosive. The Norinco stuff shown earlier probably aren't and a lot of the spam cans of ammo probably aren't either. The bottom line to it all is- it won't hurt your gun unless you stick it in a damp corner somewhere and forget to clean it. Soldiers used a hell of a lot of corrosive ammunition in warfare and didn't always have the time to clean their guns. People have become paranoid over corrosive ammunition. I have shot cases and cases of different types of corrosive ammunition. I always clean my guns within a day or so of coming home from the range. They clean up perfectly and all my guns are like new. Don't worry about corrosive ammunition, just clean your guns after use. VERY SIMPLE, Isn't IT????