Bruce Canfield (who knows a thing or two on the topic) agrees, generally, with
@NIGHTLORD40K, above.
Although I think he may put the NPM ahead of Winchester, due to the tiny number of "all NPM" produced--that's from memory, which could be flawed. And I have a sleeping dog on my foot, so I can't walk the 14' to the bookcase with the Canfield book in it (and, as always, I'd lose and hour or three rereading it [
]).
Total production of Carbines was staggering, if memory serves, the production lines did not fully stop until about Christmas, 1945. Rather large numbers of Carbines straight from the factories were just stacked up in warehouses, pristine. In 1947, DoD was ginned up, and they were all Space Age fancy. Then 1950 hit. Regiments and Divisions processed,
poste haste, all their arms through the Armorers to ensure all arms were fit for Combat Service.
That process was pretty simple, all the parts were taken down to bits, and each bit went into a bin, and was then cleaned
en masse, and go/nogo checked for tolerance. Weapons were rebuilt with all working parts. Parts were parts. Speed was of the essence. Cosmoline still in the thing? Strip it down!
Then, suddenly, it was 1953, and Peace broke out again. Back to garrison and post duty.
There were still thousands of Carbines out there. Many were mustered out with the troopie they were issued to. Some of those were straight from a rack, and had not been through Battalion or Regiment armorers. So, there were plenty of "all matching"; bunch of the DCM ones were straight from warehouses. But, there were plenty of mixmasters, too.
But, the European thing of putting serial numbers on everything created an ethos where "all matching" was prized. Yet, one of the great victories of the US was to create an arms industry that could make firearm parts to standards good enough that they could be swapped between any working firearm of the same type.
For me, yes, there's a
cachet to a "more correct" (and that's a loaded and inapt phrase) Carbine. But, it's not a be-all, do-all. And without a very solid provenance, not worth a major uptick in price.