My first M1 Carbine

[painter777]

I didn't mean that 'ALL the punch marks mean't NPM.
NPM used a punch mark, on the barrels they used and normally placed these marks near the barrel's Proof Stamped P.
This more than likely means you can be pretty sure.......... that's the original barrel, or that it was surely used on a NPM.

Your correct on all your stock markings/meanings/locations. Way to research, you do know 'Doing Research' is the 2nd or 3rd known symptom (ranking dependent on your level of addiction) down the road to carbine addiction

The Stamped P on frt of the grip can just mean the weapon was test fired after some service work...etc.

Have you tried every position possible looking for a Inland Crossed cannons stamp on the Right rear side/ Just about 1-2" forward of the oval cut oiler slot???
Look Close........ I think you'll find a piece of it.
Oh, BTW Looking for a Faint Crossed Cannons stamp is 3rd or 4th on the list....

Cleaned up very nice.
Did you copy down all the parts markings and types?

Thx,
Charlie-painter777