There are several good videos on how to remove Cosmoline if that’s what it is. The gun really looks nice and for 150$, I hope you feel guilty.
My one suggestion is to have the head space measured. That’s always a good thing to do with old military firearms.
The 03 is a gun that every collection must have. It’s as much of an icon as the Grand and the Mauser 98.
“Peace is that brief glorious moment in history when everybody stands around reloading.” – Thomas Jefferson.
Politician's are like diapers.
You need to change them often,,,,, for the same reason!