There aren't a lot of .45 rifle length barrels out there that would have proper steel and twist for .45 ACP. Shilen makes a 28" that should be OK, but the barrel alone, unthreaded and unchambered, runs around $200. Installation would be at least that again. Reboring and rerifling the original barrel is an option; most gunsmiths don't do it (too much investment in tooling for too few jobs) but some do. Maybe someone can come up with a name. In any case, I think you would be looking at big bucks just for a novelty.
P.S. Don't let a barrel less than 16" get on a rifle at any time - legal no-no.
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