So I was in the process of my cosmoline removal from my sks, I put all metal parts in some boiling water, it helped, dried them then blasted them with G96 Crud Buster.... The Crud Buster removed ALL of the cosmoline... and I mean ALL of it.
The gun is one of the Marstar Chinese SKS rifles.
One problem, whilst boiling I noticed part of the under side of the receiver turn a reddish rust color.
After apply crud buster when I wipe it down with some bounty the color transfers to the paper towel but it doesn't seem to leave the receiver.
Heres a pic.
Is this actual rust? or just some stubborn cosmoline, or something else. Should I be worried?
I haven't done the barrel yet so I'm not sure if any of this stuff is there.
The gun is one of the Marstar Chinese SKS rifles.
One problem, whilst boiling I noticed part of the under side of the receiver turn a reddish rust color.
After apply crud buster when I wipe it down with some bounty the color transfers to the paper towel but it doesn't seem to leave the receiver.
Heres a pic.
Is this actual rust? or just some stubborn cosmoline, or something else. Should I be worried?
I haven't done the barrel yet so I'm not sure if any of this stuff is there.



















































