I have a custom Colt ORM 1991A1 that started life as a .38 Super, now it has barrels fitted for .38 Super, 9mm, and 9x23 Winchester. The extractor and ejector have been tweaked so that they work with all three cartridges and the gun functions perfectly regardless of which one I'm shooting. All that's required is swapping barrels, bushings, and recoil springs. The Super and 9x23 use the same mags and I run dedicated 9mm mags when shooting it.
