My guess is SAE 4130. Alloy steels became popular prior to WW1 in the auto industry. Weapon manufacturers used it in there products including Fox during the war. Fox had a surplus of barrel steel post WW1 which they called Cromax which was believed to be SAE 4130. 4130 is 20-30% stronger than 1020, cost was acceptable, and was plentiful in the 1930's as the airplane industry used great quantities. I do not think the purchasing agents at Remington would have been willing to order a variety of steels for a low volume product such as Parkers. Use what we have!
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