I would check the engraving to see if it was over polished before it was blued. If the engraving is sharp the blue can be removed with CLR (at your local grocery store). Pour the CLR in a container large enough to hold the receiver, put the parts in and let set for 30 minutes or so. Be sure to disassemble the action first, CLR is mild so it will not pit or damage the metal within reason, it can be diluted with water. Polish with a gray 3m pad carefully.

I learn something every day, and a lot of times it's that what I learned the day before was wrong