Err, ROUND LOG (presumably to remind people to update a log of rounds fired in the rifle) and in German "Schusszahl Dokumentieren!" basically saying the same thing: "Record/Document the Shot/round count".
Scary they feel the need to engrave a GIANT reminder on the receiver?? Where is "load rifle" and the rest sheesh, and this is a German .mil rifle?
"All that is necessary for the triumph of evil is for good men to do nothing"