I've been told that IBM barrels used by NPM have a punch mark.
I believe the punch mark would be near the P proof, IIRC.
I trust the source of this info.

I thouht I could just swap the no date IBM barrel from a SG receiver I have. Then buy or swap the SG for a late NPM receiver and be on my way.
Sounds like this isn't the case.

Can anyone show me a picture of this punch mark?

Appreciate any help.


TIA,
Charlie-painter777
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