[OXENinFLA]

I don't think that's it.

Durbin referred to a mill in Pennsylvania.

What you just posted is a "manufacturer" not a foundry.

Clifton Steel works with the steel but it's doesn't look like they found* the steel.

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*found
1. To melt (metal) and pour into a mold.
2. To make (objects) by pouring molten material into a mold.

[snopercod]

Well that's the whole point. Any mill can make steel to the required specifications, but to turn it into armor plate, it must be heat treated, then tempered.

Then, it must be fabricated into the required shapes, an operation requiring very special tools on hardened steel.

Did you even read the info on Clifron's website?