I may be wrong, but I don't recall Ruger ever producing this model. It is a 45 Colt/45 ACP convertible. Just askin'. Owner says it is factory?????
https://www.northwestfirearms.com/threads/ruger-blackhawk-bisley-convertible-45-colt-acp-7-5.288059/#post-2150801
Dave
https://www.northwestfirearms.com/threads/ruger-blackhawk-bisley-convertible-45-colt-acp-7-5.288059/#post-2150801
Dave