I traded for a Century Cetme and after test firing it I was getting some gas blow back coming back on the casings after it fired and I was also not cycling just right. So thinking it just needs a real good cleaning. I broke the gun down and started with my cleaner. Noticed that my rag was turning black. After looking at the issue further it seems that it has been painted. Just wondering if any one else has had this problem and what the best thing to fix it.