most cold roll is 1018 or 1020, A-36 is hot roll and can be hardened to R 42 and does not need annealing before machining
it would be perfectly acceptable for making a lot of gun parts,
you wouldnt want to make a bolt or firing pin from it or sear mechanism for modern high powered rifles but it would be fine for other applications
like Black powder rifles and pistols and black powder revolver frames and even cylinders.
it is not a replacement for ordinance steels, Chromalloy and 316 stainless but it is acceptable for certain applications.
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when attempting to design something totally idiot proof
the ingenuity of total idiots is often overlooked.
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