What the the chances this is DCM

[painter777]

did DCM even ship Carbines with type I rear sights?

They came in all flavors.
The M1 carbines sold through the DCM in the 1960's were "unserviceable-unclassified, safe to fire". Meaning they could be in any condition, new, used, or re-built . They were sent in the condition they were stored in, meaning as packed and no further upgrades etc would be carried on. Shipped with no magazine, sling, or oiler.
Years ago I had read that these sales were recorded by RIA (IIRC) and could be verified through the CMP. But I'm not positive about this sales record/CMP Verification.

I remember someone here had put up pics of the NRA application form, but don't recall who it was.

Bruce McA, Could likely add to this. If he Sobers up