"Decarbonized Steel" is "Bessemer process homogenous wrought iron" and was sourced from Remington Arms. Pages 503 & 504 of The Parker Story state that Parker changed the name to "Plain Steel" as Remington was using the name "Decarbonized" on their newly introduced double gun.

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1869 Price List

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"Best Gun Iron" were the musket barrels used on "Charles Parker Makers" guns

1866 Price List

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This question comes up frequently and maybe could be added to the FAQs?

Thanks Drew! I seem to always get these confused. Homogeneous Wrought Iron....I think I would still think real hard about shooting these old barrels though.