It should fit just fine. I don’t have the 19 variant, but my 17 fits my 34 holster just fine. If you have an “open” holster it should still fit without any issues. I have used it with my normal CC/EDC holsters as well as my OWB range holster for my 17 with no issues. It’s honestly going to come down to preference or willingness to buy a new holster.