"Inland" Manufacturing M1 Carbines - 1st hand experience

[Seaspriter]

Really makes one appreciate the various contractors that did things correctly under wartime pressures

Welcome to Milsurps.
You are quite right. Given the pressures of war, the difficulty converting from civilian to military production (IBM always amazes me) and the shortage of supplies, the criticality of quality control, the complexity of the supply chain, and the need to use new machinery, it is just remarkable how we could build weapons -- not just M1s, but tanks, ships, and planes. It is grand testament to the power of teamwork and an aligned nation.

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[DaveHH]

During WW2 there were a LOT of people who had worked as machinists and metal guys. Welders, sheet metal men, etc. Most people who work with metal understand it and know what works. I suspect that the guy who can crank up a lathe and make a part without a high scrap rate are few and far between today. Parts are injection molded today and lathes are CNC controlled to keep scrap rate low. I'd bet that this is part and parcel to why we see poor heat treatment and failures that are simply unacceptable.