The .38 Super slide and the 9mm slide use the same breech face, ejector, extractor. The mags for the .38 Super will work with the 9mm (but the correct ones are better).
There are "drop in" barrels, but don't expect great accuracy.'
Shoot the snot out of it and see how things go with the .38 Super. With reloading, bullet weights and power factors can be adjusted to the "sweet" spot.
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