I have not looked specifically at that conversion, but I don't think you need anything but the barrel if you can find one. The rest should be OK.
You might be able to shoot 9mm P. out of that pistol as is, since the 9mm P. tapered case wedges into the 9mm Largo chamber IF dimensions are just right.
A few years ago, 9mm Largo was about impossible to find except for some corrosive and generally poor condition surplus, but today the ammo is available as well as cases and dies, so there is less reason to change those guns over.
Jim
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