I just acquired a 1968 Yugo SKS a couple days ago. I bought it as a collectible. my buddy said it won’t cycle. bought it off him for $260. I urge anyone who ever buys any surplus rifle to make sure you clean the Cosmoline from it! his gas piston (as well as the rest of the gun) was doused in cosmoline and could not cycle! Luckily he barely fired it a few times and nothing went wrong. Barrel rifling is in amazing condition!
im thinking of starting a topic on cleaning cosmoline or maybe making a video