As I have said previously:

When evaluating a USGI (non import) Carbine that has parts and/or finish that do not conform to orginal manufacture specifications, consider that during its service lifetime it may have:

1. Been used in combat in WWII and had parts (randomly selected without regard to manufacturer) replaced by Field Maintenance.

2. Undergone Arsenal/Depot rebuild* after the war (randomly selected parts without regard to manufacturer).

3. Been returned to service in the Korean war and again had parts (randomly selected without regard to manufacturer) replaced by Field Maintenance.

4. Been rebuilt* by an overseas Depot (randomly selected parts without regard to manufacturer) Note: stock not stamped as rebuilt.

5. Been returned to service again as, for example, a Firing Range carbine and had parts (randomly selected without regard to manufacturer) replaced by Field Maintenance.

* Rebuild might have included Stock/Handguard replacement, barrel replacement and re-parkerizing.

OR .......... parts may have been replaced and/or refinishing performed by a subsequent civilian owner after the carbine's service lifetime.

Of course, it is now your carbine and you can re-configure it and/or re-finish it as you please.