Hi guys, sorry in advance if i have posted this in the wrong section. Also I used to search to find a cleaning thread for corrosion and had no luck. I have a CZ 858 that I lent to a friends before the reclassification. He told me that he had cleaned it thoroughly before returning it to me. I just pulled it out of storage after about 4 or 5 years and took it apart. it is rusted inside the barrel and the gas piston has rust on the end of it. also where the gas piston fits inside is rusted out. please help as i need some tips on how to remove the rust without damaging the rifle further.



















































