That is another issue and that was the first thing I thought too.
But this one is a head scratcher as I have not run into that in a while.
The part that is bad is one you would not expect.
Just do as I do.
clean all of your rifles like you are shooting corrosive Ammo and all good.
been shooting milsurps for so long that is the only way I clean my rifles and pistols.
just an FYI
I got to looking at my new build Kit and I found some cool markings on the Stock and Dong.
Will be putting this together this weekend (Hopefully)
Will post pictures of the build as I do it in the Build Thread.