You should be able to drop a 1907 barrel right in.
Not even sure that the 1915's changed. I have two 1915's, in 380, one had a damaged barrel and I had a new one made for a cost of $200, works great. The other barrel was well worn and I didn't want to spend another $200 on it so I got a factory barrel and dropped it in, gun shoots fine to this day.
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