According to this document – http://static.awm.gov.au/images/collection/pdf/RCDIG1070658–1-.PDF – the Hispano was made by CAC, but at a very low rate of production. The “souvenired” example may well have been reverse-engineered as a private venture, but it didn’t lead to a massive production run – appropriate raw materials were in short supply, and the need was then filled by guns imported from Britain.