Hey everyone,

I picked up a Chinese SKS from Classic Firearms yesterday and I've almost got it all cleaned up (cosmoline) that is. I noticed some rust areas (on the barrel / receiver and magwell). You can tell it's pitted as well in those areas and I'm requesting your expertise in helping me determine the year / any identifiable info on this rifle. There is only a 5 digit serial number along with the "F5639" marking underneath the barrel / receiver.



Regarding the rust, should I remove it? Should I keep it oiled / greased in those areas? And most importantly, is it safe to shoot?

Here are some pictures:

"F5639" (under the barrel / receiver)



Sights:



Stock:





Rust Areas:

Magwell:



Barrel / Receiver Left Side:




Barrel / Receiver Right Side:



Piston Area:



As always, thank you SO much for your input.