I got an sks last year that had been burnt. Every part was mismatched & trigger springs rusted completely. I was going to Polish it up, but after scraping off the heavy black paint I knew something wasn't right. I filled & sanded the barrel & noticed the heavy discoloration was right through the metal. ! Absolute Junk. Instead of being bright & shiny like other ones I did......this one stayed patchy blue. these are bottom barrel for sure.