I would not change it a bit.
If there is any active rust oxidation, you can use well oiled 0000 steel or bronze wool on a well oiled surface. Don't rub it hard. Just slow gentle work will help stabilize it.
Many Lugers have areas of pitting due to storage. In truth, you would be better to invest in a second high condition one. You'll never see return for your investment in restoring one.
Carefully remove the grips (see the FAQ) prior to working on it further.
I honestly can't find the areas in your pictures.
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 Igitur si vis pacem, para bellum -
- Therefore if you want peace, prepare for war.
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