You have to remember that there is not 100% parts interchangeability between FN Herstal made Hi-Powers (P35) and Canadian Inglis models. The FN models were metric whereas the Inglis models were SAE standard.
I was given a complete armourer's parts replacement package with hundreds of spares by a retired arms tech who had intended to use them in gunsmithing when he retired. Once he learned of the difference, he lost interest.
I passed them off to another 'smith who at first refused to believe me until he ordered a Bar Sto barrel for a Hi-Power he was building for a customer. First question - "Is it an FN produced military/commecial model or an Inglis?"