Never underestimate the power of creative inspiration. Last weekend I bought a Smith-Corona 03A3 Springfield barreled action as a restoration project. The barrel was bobbed, but good news is that the receiver hadn't been drilled and tapped or reprofiled, altho it was lovingly polished with all parkerizing removed above the stock line. The bad news is that someone tried his hand at jewelling the metal and did a pretty nice job on the bolt collar and the extractor. Fortunately he left the bolt body alone, but did try a bit on the receiver rail before running out of ambition. The jewelling isn't that deep so it should polish out OK before I sand blast the parts for reparkerizing. I've seen jewelled bolts before, but never the bolt collar alone.
I have a NOS Remington 03A3 replacement barrel and a enough Smith- Corona parts for as complete restoration after parkerizing the receiver. I've found a number of Remington made 03A3 replacement barrels over the years, but never a Smith-Corona. My bets are that all military 03A3 barrel replacements used Remington barrels.