I have seen nothing on any modifications and assume there were none. Most folks who carried a Navy Colt liked the balance with the original barrel length, and also shortening the barrel makes the rammer harder to use. In that era, barrel length was not a big concern in a holster gun. (The Army was using a 7" Colt .45.) Only later, partly due to the improvement in powder, did shorter barrels come into vogue.
Jim
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