I don't find any problem with cosmo at all. I've purchased 3 rifles in cosmo.......field strip.......boiling water in rubbermade bins and dump all the metal parts in the bin......cosmo floats to the top.......remove the parts and clean with clp. Wood parts......hair dryer and rags. Total time from cosmo to clean and ready to shoot is max 1 hour.If you want an sks, skip the Yugo. Look at a nice condition Chinese and a Russian . The Yugos are covered in cosmo and still imported. The other 2 you can find clean and are no longer imported. Spend the extra 100 or so.