I would agree that the 'haloes' look suspect, but a pantograph engraving tool uses a rotating cutting tip, which leaves rounded ends. The '4' and the cursive 'n' look OK to me. I also think the C/N would show signs of a mismatched finish/'level' to the surrounding area, and it doesn't.
It could be a beginning mechanic. Or just a tired old handgun.
250 rds of ammunition is only ~$100 at Midway's prices [Finocchi]. They still had it in stock a week ago.
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I like my coffee the
way I like my women...
...Cold and bitter... 
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