WWII M1911A1 Barrel

[Mikecp@2022]

My M1911A1 mfg by Colt left the factory by February 17, 1943 to Springfield Armory.
This gun has a Springfield blue barrel marked on left lug S P and a heat lot number AG1.
Now could you explain what I read about it; Also found in some new 1943 contract guns.
Is that possible this gun left the factory with a field replacement barrel? Or this has been changed at a later period. I must add the gun does not wear any arsenal mark as AA, RIA, SA, RA...

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