The Ruger barrel cannot be replaced by anyone but the factory. The reason is that the barrel is not indexed. It is screwed into a blank threaded tube and the feed ramp is used as a reference point to machine the rest of the receiver with the barrel already installed.
Ruger barrels are not sold by the factory or by anyone else. One could be made but I doubt that any gunsmith would tackle the job given the complexity.
Call Ruger.
Jim
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