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It might be made to work (and we have one person who has already said he made it work), but it won't be right. Every 1911 maker offering a .40 S&W and/or 10mm model uses a different slide for those calibers. I have 1911s in 9mm, .40 S&W, .38 Super, and .45 Auto. The 9mm and .38 Super share slides, .40 is unique (I don't have any 10mm), and .45 is unique.
I converted a Para-Ordnance from .45 to .40. To make it work I bought a new Para ramped barrel, a new Para .40 S&W slide, a new firing pin, and a new extractor. (And new magazines, of course.)
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