Gun Parts sells 45 cal barrels. They have a kit to adapt a 1911 into a carbine with a 16-1/4" barrel and walnut board stock using a replacement main spring housing. They have several pages of barrels in their catalog.
I believe that the Spanish Destroyer also came in .45 ACP but not sure.
Actually you can make a rifle with a barrel less than 16" AFTER you get approval and a tax stamp from BATF for an SBR.
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