Fiocchi makes ammo in .30 Luger. Not sure of sources in today's market. I doubt it's in as much demand as 9mm...
There have been a couple of different lengths of receiver. It's possible that your 9mm upper might work with the frame. To fire 9mm, you probably will need a stronger recoil spring.
Note that the receiver / frame / trigger plate / take down lever were all hand fit on Lugers. For that reason, you may or may not find that your receiver will function with the frame, even if it is of the correct dimensions.
I wouldn't try it without having someone experienced with Luger gunsmithing do it.
Marc
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