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I think the very early cut & weld guns had mags marked 45 AUTO & seems that later after market mags marked 45 AUTO came along. I think the after market mags marked 45 AUTO were the ones that may or may not function. I have seen some of the 45 ACP mags that look a little rough but functioned ok. You can go to the detonics collectors website & probably get a more accurate answer.
Billy