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No, you also need a slide meant for 9mm to accommodate the smaller barrel. An exception that would allow for just a barrel+magazine change would be specific .40 to 9mm conversion barrels. I'm not seeing anything like that on Bar-Sto but there may be other manufacturers.

Hi Sean and welcome. You would need a 9mm slide and magazine to function properly. Cheers, stay safe and enjoy!

Hi Sean, no sir, you cannot use a 9mm barrel in this slide. Stay safe & have a great day!